Lab Education
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March 18, 2024

Kidney Function and the Basic Metabolic Panel: What You Need to Know

Medically Reviewed by
Updated On
September 17, 2024

For individuals concerned about kidney dysfunction and seeking clarity through diagnostic tests, the basic metabolic panel (BMP) offers valuable insights. Comprising a series of blood tests to assess key aspects of health, the BMP is an indispensable tool in the diagnostic arsenal.

By analyzing markers such as serum creatinine, blood urea nitrogen (BUN), and electrolytes, the BMP provides a comprehensive snapshot of kidney health, helping medical practitioners to screen for, monitor, and diagnose kidney-related health conditions.

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What Is a Basic Metabolic Panel?

A basic metabolic panel (BMP) is a group of blood tests commonly used to assess overall health, including kidney function, electrolyte balance, and blood sugar levels. It is often ordered as part of routine health check-ups, during hospital admissions, or when evaluating symptoms related to kidney or metabolic disorders.

A BMP measures eight biomarkers:

  • Glucose: Known as blood sugar. This is a sugar that serves as the body's primary energy source.Β 
  • Calcium: The most abundant mineral in the body. While most calcium is stored in bones, this serum calcium reflects the small percentage of calcium in circulation, important for blood clotting, nerve conduction, and muscle function.
  • Sodium: An electrolyte that predominantly comes from diet and is regulated by the kidneys. Sodium is critical for maintaining fluid balance and nerve function.Β 
  • Potassium: An electrolyte that is present in many foods. Essential for muscle and nerve function.Β 
  • Chloride: The second most abundant electrolyte in the body. It regulates fluid levels, supports digestion, and keeps acid-base status balanced.
  • Bicarbonate: Indicative of the amount of carbon dioxide in the blood and regulates acid balance. Bicarbonate is excreted and reabsorbed by the kidneys.
  • Blood Urea Nitrogen (BUN): A measure of nitrogen in the blood that comes from urea, a waste product of protein metabolism that the kidneys remove from the blood.
  • Creatinine: A waste product generated by muscle metabolism that the kidneys remove from the blood.

Kidney Function and Its Importance

The kidneys are bean-shaped organs located on either side of the spine, just below the rib cage. Each kidney is approximately the size of a fist and is composed of an outer cortex and inner medulla. The renal pelvis collects urine produced by the kidneys, which then travels through the ureters to the bladder for excretion. (26)Β 

The kidneys filter wastes from the blood and eliminate them from the body via urine. Blood enters the kidneys through the renal arteries. Inside the kidneys, this blood flows into tiny filters called nephrons. These nephrons act like microscopic cleaning stations. As blood passes through them, they sift out waste products like urea, creatinine, and excess salts. Think of it like a sieve separating grains from sand. The clean blood is reabsorbed back into circulation, while the waste products and extra fluids are turned into urine. (26)Β 

The kidneys are also responsible for:

  • Regulating blood pressure by controlling fluid volume through the renin-angiotensin-aldosterone system (RAAS)
  • Maintaining acid-base balance (blood pH levels)
  • Producing calcitriol and erythropoietin. Calcitriol is a form of vitamin D that helps the body absorb calcium. Erythropoietin stimulates the production of red blood cells.Β 
  • Regulating electrolyte levels by selectively reabsorbing or excreting them

BMP Components Relevant to Kidney Function

Understanding kidney health and function requires delving into the components of the BMP that directly relate to the kidneys.

Blood Urea Nitrogen (BUN)

BUN is a blood test that measures the amount of nitrogen in your bloodstream that comes from urea, a waste product produced by the liver when it breaks down proteins. (10, 38)Β 

When your kidneys function properly, they filter urea out of the bloodstream and excrete it in the urine. Elevated BUN levels can indicate that the kidneys are not effectively removing urea from the blood, suggesting impaired kidney function. This could be due to acute or chronic kidney disease or urinary tract obstruction. (10, 38)Β 

Creatinine

Creatinine is a waste product generated by the muscles during normal metabolism. Healthy kidneys efficiently filter creatinine from the bloodstream and excrete it through urine. (9, 38)Β 

Like BUN, elevated creatinine levels in the blood suggest reduced kidney function, as impaired kidneys struggle to filter and excrete creatinine effectively. (38)Β 

Glomerular filtration rate (GFR) represents the rate at which blood is filtered by the glomeruli in the kidneys per unit of time. Creatinine levels are used, along with other factors such as age, sex, and race, to estimate GFR (eGFR). This estimation uses formulas such as the Modification of Diet in Renal Disease (MDRD) equation or the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation. These formulas utilize creatinine levels to approximate GFR, providing another valuable data point for kidney function. (9)Β 

ElectrolytesΒ 

Because the kidneys play a central role in regulating electrolyte balance and pH (acid-base balance), high or low levels of sodium, potassium, chloride, and bicarbonate can signal kidney impairment, such as acute kidney injury (AKI) or chronic kidney disease (CKD). (14)

Interpreting BMP Results for Kidney Health

Elevated BUN and serum creatinine levels may indicate impaired kidney function, suggesting decreased filtration capacity. Monitoring these level trends over time can help track the progression of kidney disease. (8)Β 

The BUN/creatinine ratio is derived by dividing BUN by serum creatinine; it helps assess kidney function and hydration status. A normal BUN/creatinine ratio in adults is 10-20:1. Certain trends in the BUN/creatinine ratio provide insight into the underlying causes of kidney dysfunction.Β 

Kidney disease puts patients at an increased risk of electrolyte disorders. Hyperkalemia (too much potassium) and hyponatremia (too little sodium) are common disorders in patients with kidney disease. (16)Β 

Metabolic acidosis, prevalent in CKD patients, involves an accumulation of acid in the body due to a loss of bicarbonate, an alkaline substance that buffers acids. This acid imbalance can have detrimental health effects. (27, 29)Β 

It's important to remember that abnormal BMP results do not always mean the kidneys are compromised. Hydration status, intense physical activity, protein intake, supplements, and medications can influence kidney biomarkers (10). This is why it is important to interpret BMP results in conjunction with patient symptoms and medical history. When abnormal results occur, your healthcare provider can repeat testing and order additional labs to confirm the cause of abnormal values.

Common Conditions Detected Through the BMP

Understanding the significance of BMP results is essential for timely intervention and effective management of health conditions, ultimately promoting better health outcomes for patients. Let's discuss some conditions that can be diagnosed and monitored with the BMP blood test.Β 

Chronic Kidney Disease (CKD)

In CKD, the kidneys gradually lose function over time. The BMP can reveal elevated serum creatinine and BUN levels, indicating reduced kidney function. Additionally, abnormalities in electrolyte levels, such as hyperkalemia or metabolic acidosis, are consequences of reduced kidney function. (22, 36)Β 

Acute Kidney Injury (AKI)

AKI is a sudden decline in kidney function, often due to conditions like dehydration, infection, or medication toxicity. The BMP can detect elevated creatinine and BUN levels, reflecting impaired kidney function. Hyperkalemia and metabolic acidosis may also be present in AKI. (18, 22)Β 

Dehydration

Dehydration occurs when the body loses more fluid than it takes in. The BMP may reveal elevated levels of BUN and creatinine due to decreased kidney perfusion. The BUN/creatinine ratio is higher than 10:1 in dehydrated patients. Loss of blood volume can also cause electrolytes to become concentrated, resulting in measurable elevations in electrolyte levels on the BMP. (35)

Electrolyte Imbalances

The BMP can detect abnormalities in electrolyte levels, which may result from kidney dysfunction. For example, hyperkalemia or hyponatremia may indicate kidney impairment. (14)

When to Get a Basic Metabolic Panel

Discussed below are common reasons your doctor may order a BMP.

Routine Health Screenings

A BMP may be included in routine health screenings during annual check-ups for individuals without known kidney disease or risk factors. This allows for early detection of any abnormalities in blood sugar, kidney function, and electrolyte balance.

Individuals with risk factors for kidney disease, such as advanced age, family history of kidney disease, obesity, or smoking, may benefit from more frequent kidney screening to detect early signs of kidney dysfunction.

Monitoring Existing Health Conditions

Individuals with existing health conditions that impact kidney health, such as hypertension, diabetes, or cardiovascular disease, may require more frequent BMP testing. Healthcare providers may recommend regular monitoring of kidney function to assess disease progression and treatment effectiveness.

Patients with diagnosed kidney disease, including CKD or AKI, need BMP testing at regular intervals to monitor kidney function and electrolyte levels. Testing frequency depends on the stage of kidney disease and individual patient factors.

Medication Management

Certain medications can cause electrolyte imbalances and negatively affect kidney function.

Healthcare providers may recommend evaluating kidney function before initiating these medications and periodic BMP testing during treatment to monitor for electrolyte imbalances or kidney-related complications.

Acute Illness or Hospitalization

BMP testing may be performed during acute illness or hospitalization to evaluate kidney function, particularly in cases of dehydration, infection, or acute medical conditions that can impact renal function.

Lifestyle and Diet for Healthy Kidney Function

Maintaining healthy kidney function is crucial for overall well-being, and lifestyle and dietary choices play a significant role in supporting kidney health. Here are some recommendations to support kidney health:

  • Stay hydrated: Adequate hydration is essential for kidney function as it helps flush out toxins and waste products from the body. Aim to drink plenty of water throughout the day, especially in hot weather or during physical activity.
  • Eat a healthy diet: Standard American diets are high in sodium and sugars, which can increase blood pressure and blood sugar, putting a strain on the kidneys. Opt for a diet rich in fresh, whole foods and limit processed and packaged foods. Use herbs and spices to flavor foods instead of salt. (15)Β 
  • Control blood sugar: High blood sugar levels can damage the kidneys over time. Manage blood sugar levels by limiting your intake of sugary foods and beverages, choosing complex carbohydrates over refined ones, and eating plenty of fiber. (7)Β 
  • Maintain a healthy weight: Being overweight or obese can increase the risk of developing kidney disease and other health complications. Aim for a healthy weight by adopting a balanced diet and engaging in regular physical activity.
  • Limit alcohol: Excessive alcohol consumption can strain the kidneys and lead to dehydration. If consuming alcohol, drink in moderation.
  • Exercise regularly: Regular physical activity helps maintain cardiovascular and kidney health. Aim for at least 30 minutes of moderate-intensity exercise three days a week.
  • Manage blood pressure: High blood pressure is a leading cause of kidney failure. Manage blood pressure through lifestyle modifications such as maintaining a healthy diet, regular exercise, limiting alcohol and sodium intake, and taking medication if prescribed by a healthcare provider.

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Key Takeaways

The basic metabolic panel is an inexpensive blood test that measures several pertinent markers of kidney function. By measuring serum creatinine, BUN, and electrolyte levels, the BMP is a valuable tool for screening, diagnosing, and monitoring health conditions related to the kidneys.Β 

The BMP provides insights into kidney health so individuals can take proactive steps to optimize it. Patients should be encouraged to engage in conversations with their healthcare providers about their BMP results, discussing what they mean for kidney function and systemic health.Β 

For individuals concerned about kidney function and seeking clarity through diagnostic tests, the basic metabolic panel (BMP) offers valuable insights. Comprising a series of blood tests to assess key aspects of health, the BMP is a useful tool in the diagnostic process.

By analyzing markers such as serum creatinine, blood urea nitrogen (BUN), and electrolytes, the BMP provides a comprehensive snapshot of kidney health, helping medical practitioners to screen for and monitor kidney-related health conditions.

[signup]

What Is a Basic Metabolic Panel?

A basic metabolic panel (BMP) is a group of blood tests commonly used to assess overall health, including kidney function, electrolyte balance, and blood sugar levels. It is often ordered as part of routine health check-ups, during hospital admissions, or when evaluating symptoms related to kidney or metabolic concerns.

A BMP measures eight biomarkers:

  • Glucose: Known as blood sugar. This is a sugar that serves as the body's primary energy source.Β 
  • Calcium: The most abundant mineral in the body. While most calcium is stored in bones, this serum calcium reflects the small percentage of calcium in circulation, important for blood clotting, nerve conduction, and muscle function.
  • Sodium: An electrolyte that predominantly comes from diet and is regulated by the kidneys. Sodium is critical for maintaining fluid balance and nerve function.Β 
  • Potassium: An electrolyte that is present in many foods. Essential for muscle and nerve function.Β 
  • Chloride: The second most abundant electrolyte in the body. It regulates fluid levels, supports digestion, and keeps acid-base status balanced.
  • Bicarbonate: Indicative of the amount of carbon dioxide in the blood and regulates acid balance. Bicarbonate is excreted and reabsorbed by the kidneys.
  • Blood Urea Nitrogen (BUN): A measure of nitrogen in the blood that comes from urea, a waste product of protein metabolism that the kidneys help remove from the blood.
  • Creatinine: A waste product generated by muscle metabolism that the kidneys help remove from the blood.

Kidney Function and Its Importance

The kidneys are bean-shaped organs located on either side of the spine, just below the rib cage. Each kidney is approximately the size of a fist and is composed of an outer cortex and inner medulla. The renal pelvis collects urine produced by the kidneys, which then travels through the ureters to the bladder for excretion. (26)Β 

The kidneys filter wastes from the blood and help eliminate them from the body via urine. Blood enters the kidneys through the renal arteries. Inside the kidneys, this blood flows into tiny filters called nephrons. These nephrons act like microscopic cleaning stations. As blood passes through them, they sift out waste products like urea, creatinine, and excess salts. Think of it like a sieve separating grains from sand. The clean blood is reabsorbed back into circulation, while the waste products and extra fluids are turned into urine. (26)Β 

The kidneys are also responsible for:

  • Regulating blood pressure by controlling fluid volume through the renin-angiotensin-aldosterone system (RAAS)
  • Maintaining acid-base balance (blood pH levels)
  • Producing calcitriol and erythropoietin. Calcitriol is a form of vitamin D that helps the body absorb calcium. Erythropoietin stimulates the production of red blood cells.Β 
  • Regulating electrolyte levels by selectively reabsorbing or excreting them

BMP Components Relevant to Kidney Function

Understanding kidney health and function requires delving into the components of the BMP that directly relate to the kidneys.

Blood Urea Nitrogen (BUN)

BUN is a blood test that measures the amount of nitrogen in your bloodstream that comes from urea, a waste product produced by the liver when it breaks down proteins. (10, 38)Β 

When your kidneys function properly, they help filter urea out of the bloodstream and excrete it in the urine. Elevated BUN levels can indicate that the kidneys are not effectively removing urea from the blood, suggesting impaired kidney function. This could be due to acute or chronic kidney issues or urinary tract obstruction. (10, 38)Β 

Creatinine

Creatinine is a waste product generated by the muscles during normal metabolism. Healthy kidneys efficiently help filter creatinine from the bloodstream and excrete it through urine. (9, 38)Β 

Like BUN, elevated creatinine levels in the blood suggest reduced kidney function, as impaired kidneys struggle to filter and excrete creatinine effectively. (38)Β 

Glomerular filtration rate (GFR) represents the rate at which blood is filtered by the glomeruli in the kidneys per unit of time. Creatinine levels are used, along with other factors such as age, sex, and race, to estimate GFR (eGFR). This estimation uses formulas such as the Modification of Diet in Renal Disease (MDRD) equation or the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation. These formulas utilize creatinine levels to approximate GFR, providing another valuable data point for kidney function. (9)Β 

ElectrolytesΒ 

Because the kidneys play a central role in regulating electrolyte balance and pH (acid-base balance), high or low levels of sodium, potassium, chloride, and bicarbonate can signal kidney impairment, such as acute kidney injury (AKI) or chronic kidney disease (CKD). (14)

Interpreting BMP Results for Kidney Health

Elevated BUN and serum creatinine levels may indicate impaired kidney function, suggesting decreased filtration capacity. Monitoring these level trends over time can help track the progression of kidney issues. (8)Β 

The BUN/creatinine ratio is derived by dividing BUN by serum creatinine; it helps assess kidney function and hydration status. A normal BUN/creatinine ratio in adults is 10-20:1. Certain trends in the BUN/creatinine ratio provide insight into the underlying causes of kidney function changes.Β 

Kidney issues put patients at an increased risk of electrolyte imbalances. Hyperkalemia (too much potassium) and hyponatremia (too little sodium) are common imbalances in patients with kidney concerns. (16)Β 

Metabolic acidosis, prevalent in CKD patients, involves an accumulation of acid in the body due to a loss of bicarbonate, an alkaline substance that buffers acids. This acid imbalance can have health effects. (27, 29)Β 

It's important to remember that abnormal BMP results do not always mean the kidneys are compromised. Hydration status, intense physical activity, protein intake, supplements, and medications can influence kidney biomarkers (10). This is why it is important to interpret BMP results in conjunction with patient symptoms and medical history. When abnormal results occur, your healthcare provider can repeat testing and order additional labs to explore the cause of abnormal values.

Common Conditions Detected Through the BMP

Understanding the significance of BMP results is essential for timely intervention and effective management of health conditions, ultimately promoting better health outcomes for patients. Let's discuss some conditions that can be monitored with the BMP blood test.Β 

Chronic Kidney Disease (CKD)

In CKD, the kidneys gradually lose function over time. The BMP can reveal elevated serum creatinine and BUN levels, indicating reduced kidney function. Additionally, abnormalities in electrolyte levels, such as hyperkalemia or metabolic acidosis, are consequences of reduced kidney function. (22, 36)Β 

Acute Kidney Injury (AKI)

AKI is a sudden decline in kidney function, often due to conditions like dehydration, infection, or medication toxicity. The BMP can detect elevated creatinine and BUN levels, reflecting impaired kidney function. Hyperkalemia and metabolic acidosis may also be present in AKI. (18, 22)Β 

Dehydration

Dehydration occurs when the body loses more fluid than it takes in. The BMP may reveal elevated levels of BUN and creatinine due to decreased kidney perfusion. The BUN/creatinine ratio is higher than 10:1 in dehydrated patients. Loss of blood volume can also cause electrolytes to become concentrated, resulting in measurable elevations in electrolyte levels on the BMP. (35)

Electrolyte Imbalances

The BMP can detect abnormalities in electrolyte levels, which may result from kidney function changes. For example, hyperkalemia or hyponatremia may indicate kidney impairment. (14)

When to Get a Basic Metabolic Panel

Discussed below are common reasons your doctor may order a BMP.

Routine Health Screenings

A BMP may be included in routine health screenings during annual check-ups for individuals without known kidney disease or risk factors. This allows for early detection of any abnormalities in blood sugar, kidney function, and electrolyte balance.

Individuals with risk factors for kidney disease, such as advanced age, family history of kidney disease, obesity, or smoking, may benefit from more frequent kidney screening to detect early signs of kidney function changes.

Monitoring Existing Health Conditions

Individuals with existing health conditions that impact kidney health, such as hypertension, diabetes, or cardiovascular disease, may require more frequent BMP testing. Healthcare providers may recommend regular monitoring of kidney function to assess disease progression and treatment effectiveness.

Patients with diagnosed kidney disease, including CKD or AKI, need BMP testing at regular intervals to monitor kidney function and electrolyte levels. Testing frequency depends on the stage of kidney disease and individual patient factors.

Medication Management

Certain medications can cause electrolyte imbalances and affect kidney function.

Healthcare providers may recommend evaluating kidney function before initiating these medications and periodic BMP testing during treatment to monitor for electrolyte imbalances or kidney-related changes.

Acute Illness or Hospitalization

BMP testing may be performed during acute illness or hospitalization to evaluate kidney function, particularly in cases of dehydration, infection, or acute medical conditions that can impact renal function.

Lifestyle and Diet for Healthy Kidney Function

Maintaining healthy kidney function is crucial for overall well-being, and lifestyle and dietary choices play a significant role in supporting kidney health. Here are some recommendations to support kidney health:

  • Stay hydrated: Adequate hydration is essential for kidney function as it helps flush out toxins and waste products from the body. Aim to drink plenty of water throughout the day, especially in hot weather or during physical activity.
  • Eat a healthy diet: Standard American diets are high in sodium and sugars, which can increase blood pressure and blood sugar, putting a strain on the kidneys. Opt for a diet rich in fresh, whole foods and limit processed and packaged foods. Use herbs and spices to flavor foods instead of salt. (15)Β 
  • Control blood sugar: High blood sugar levels can affect the kidneys over time. Manage blood sugar levels by limiting your intake of sugary foods and beverages, choosing complex carbohydrates over refined ones, and eating plenty of fiber. (7)Β 
  • Maintain a healthy weight: Being overweight or obese can increase the risk of developing kidney issues and other health complications. Aim for a healthy weight by adopting a balanced diet and engaging in regular physical activity.
  • Limit alcohol: Excessive alcohol consumption can strain the kidneys and lead to dehydration. If consuming alcohol, drink in moderation.
  • Exercise regularly: Regular physical activity helps maintain cardiovascular and kidney health. Aim for at least 30 minutes of moderate-intensity exercise three days a week.
  • Manage blood pressure: High blood pressure is a leading cause of kidney issues. Manage blood pressure through lifestyle modifications such as maintaining a healthy diet, regular exercise, limiting alcohol and sodium intake, and taking medication if prescribed by a healthcare provider.

[signup]

Key Takeaways

The basic metabolic panel is an inexpensive blood test that measures several pertinent markers of kidney function. By measuring serum creatinine, BUN, and electrolyte levels, the BMP is a valuable tool for screening and monitoring health conditions related to the kidneys.Β 

The BMP provides insights into kidney health so individuals can take proactive steps to support it. Patients should be encouraged to engage in conversations with their healthcare providers about their BMP results, discussing what they mean for kidney function and systemic health.Β 

The information in this article is designed for educational purposes only and is not intended to be a substitute for informed medical advice or care. This information should not be used to diagnose or treat any health problems or illnesses without consulting a doctor. Consult with a health care practitioner before relying on any information in this article or on this website.

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Lab Tests in This Article

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National Cancer Institute
Government Authority
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World Health Organization (WHO)
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The Journal of Pediatrics
Peer Reviewed Journal
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CDC
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Office of Dietary Supplements
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National Heart Lung and Blood Institute
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National Institutes of Health
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Clinical Infectious Diseases
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Brain
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The Journal of Rheumatology
Peer Reviewed Journal
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Journal of the National Cancer Institute (JNCI)
Peer Reviewed Journal
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Journal of Cardiovascular Magnetic Resonance
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Hepatology
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The American Journal of Clinical Nutrition
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The Journal of Bone and Joint Surgery
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Kidney International
Peer Reviewed Journal
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The Journal of Allergy and Clinical Immunology
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Annals of Surgery
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Chest
Peer Reviewed Journal
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The Journal of Neurology, Neurosurgery & Psychiatry
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Blood
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Gastroenterology
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The American Journal of Respiratory and Critical Care Medicine
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The American Journal of Psychiatry
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Diabetes Care
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The Journal of the American College of Cardiology (JACC)
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The Journal of Clinical Oncology (JCO)
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Journal of Clinical Investigation (JCI)
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Circulation
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JAMA Internal Medicine
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PLOS Medicine
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Annals of Internal Medicine
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Nature Medicine
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The BMJ (British Medical Journal)
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The Lancet
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Journal of the American Medical Association (JAMA)
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Pubmed
Comprehensive biomedical database
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Harvard
Educational/Medical Institution
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Cleveland Clinic
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Mayo Clinic
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The New England Journal of Medicine (NEJM)
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Johns Hopkins
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