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Basic Metabolic Panel (BMP)
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

Basic Metabolic Panel (BMP)

The Basic Metabolic Panel (BMP) is a blood test that measures eight key substances to assess fluid balance, metabolism, and kidney function.

Overview

A Basic Metabolic Panel (BMP) provides a snapshot of your general health by measuring eight specific components in your blood:

  • Glucose: The body’s primary energy source; high levels may indicate diabetes.
  • Calcium: Essential for nerve, muscle, and heart function, as well as blood clotting.
  • Electrolytes (Sodium, Potassium, Carbon Dioxide, Chloride): These minerals help regulate fluid balance, pH levels, and the function of the nerves, muscles, and brain.
  • BUN (blood urea nitrogen) and Creatinine: Waste products that indicate how well the kidneys are filtering the blood.

Uses

The BMP is used to screen for health conditions, monitor chronic diseases like high blood pressure or kidney disease, and evaluate overall body function, including metabolism and acid-base balance.

Why It Is Performed

The test is often included in routine checkups to identify issues before symptoms arise. It may also be ordered if a patient experiences fatigue, confusion, breathing difficulties, or persistent vomiting, or if they are being treated in an emergency setting.

The Procedure

A healthcare professional collects a blood sample from a vein in the arm using a small needle. The process is quick, typically taking less than five minutes. Patients may be required to fast for eight hours prior to the test.

Results

Abnormal results may suggest various health issues, including kidney disease, breathing problems, or complications from diabetes. Because a single abnormal result does not provide a definitive diagnosis, providers typically consider the patient's symptoms, medical history, and other test results to interpret the findings.

Related Tests

A Comprehensive Metabolic Panel (CMP) is similar to a BMP but includes six additional tests to evaluate liver health, including albumin, total protein, liver enzymes (ALP, ALT, AST), and bilirubin.

Frequently Asked Questions

Yes. Most labs ask you to fast for at least 8 hours, mainly because food can raise glucose and affect calcium and electrolyte levels, potentially giving a false‑high glucose or altered calcium reading. If you eat or drink anything other than water before the draw, tell your provider so they can interpret the numbers correctly.
Mild hypokalemia may cause muscle weakness, cramping, fatigue, or irregular heartbeats. To raise potassium, increase intake of potassium‑rich foods such as bananas, oranges, potatoes, spinach, and beans. If your level is markedly low (<3.0 mmol/L) or you have cardiac symptoms, your doctor may prescribe potassium supplements; never start supplements without medical guidance.
high BUN/creatinine ratio (usually >20:1) often points to dehydration, high protein intake, or gastrointestinal bleeding. It can also appear with certain medications (e.g., steroids). If you have symptoms like excessive thirst, dry mouth, or reduced urine output, or if the ratio stays high on repeat testing, contact your clinician for further evaluation of kidney function and fluid status.
For chronic conditions like hypertension or CKD, most providers repeat a BMP every 3–6 months to monitor kidney function (creatinine, BUN) and electrolytes. If your disease is stable, annual testing may be sufficient; however, any change in medication, diet, or symptoms should prompt earlier re‑testing.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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