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Basic Metabolic Panel (BMP)

Published: August 1, 2026Updated: August 1, 2026

A blood test that measures key substances in your blood to evaluate kidney function, blood sugar levels, and electrolyte balance.

Quick summary

["Measures glucose (blood sugar) to check for diabetes or hypoglycemia","Evaluates kidney function through BUN and creatinine levels","Assesses electrolyte balance (sodium, potassium, chloride, CO2)","Includes calcium levels for bone and nerve health","Often used in routine checkups and emergency settings"]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 1, 2026Editorial policy

Key facts at a glance

Category
chemistry
Sample
serum
Container
red-top or SST
Fasting
true

What is a Basic Metabolic Panel (BMP)?

A Basic Metabolic Panel (BMP) is a common blood test that measures several key substances in your blood. It provides important information about how well your kidneys are working, your blood sugar levels, and the balance of electrolytes in your body. This test is frequently ordered as part of routine health examinations, pre-surgical screening, or when patients present with symptoms like fatigue, weakness, or confusion.

What tests are included in a BMP?

  • Glucose (Blood Sugar) - Measures your blood sugar level to check for diabetes or hypoglycemia
  • Calcium - A mineral essential for bone health, nerve function, and muscle contraction
  • Sodium - An electrolyte important for fluid balance and nerve/muscle function
  • Potassium - An electrolyte critical for heart and muscle function
  • Chloride - Helps maintain fluid balance and stomach acid production
  • Carbon Dioxide (CO2) - Indicates how well your body balances acids and bases
  • Blood Urea Nitrogen (BUN) - Measures kidney function by showing how much nitrogen is in your blood from waste products
  • Creatinine - A waste product filtered by kidneys; high levels may indicate kidney problems
  • Estimated Glomerular Filtration Rate (eGFR) - Calculated from creatinine to assess how well your kidneys filter blood

When is a BMP needed?

A BMP may be ordered for various reasons: during routine physical exams to establish baseline health values, before surgery to ensure safe anesthesia and surgery, when patients experience symptoms like frequent urination, excessive thirst, fatigue, weakness, or confusion. It is also commonly used in emergency rooms to quickly assess a patient's metabolic status, and for monitoring patients with known conditions like diabetes, kidney disease, or hypertension. Your healthcare provider may also order this test if you are taking medications that can affect kidney function or electrolyte levels.

Frequently asked questions

Do I need to fast before a BMP?
Yes, you typically need to fast for 8-12 hours before a BMP, as food and drink can affect your blood sugar and calcium levels. Your healthcare provider will give you specific instructions. Water is usually allowed during the fasting period.
What do abnormal BMP results mean?
Abnormal results can indicate various conditions. High glucose may suggest diabetes; elevated BUN and creatinine may indicate kidney problems; abnormal electrolyte levels can result from dehydration, heart issues, or medication side effects. Your doctor will interpret your results in context of your overall health and other test results.
How is a BMP different from a CMP (Comprehensive Metabolic Panel)?
A BMP includes 8-9 tests focusing on kidney function, blood sugar, and electrolytes. A CMP includes all BMP tests plus additional tests for liver function (protein, albumin, bilirubin, liver enzymes), making it more comprehensive for evaluating overall metabolic health.
Is the BMP test safe?
Yes, the BMP test is very safe. The risks are minimal and include slight pain or bruising at the injection site, lightheadedness, and very rarely, infection. These risks are similar to any standard blood draw.
How long does it take to get BMP results?
Results are typically available within 24-48 hours, though some facilities can provide results the same day. Your healthcare provider's office will contact you with the results or discuss them at your follow-up appointment.
  1. 1
    MedlinePlus - Basic Metabolic PanelSource
  2. 2
    May Clinic - Blood Glucose TestSource
  3. 3
    National Kidney Foundation - BUN and Creatinine TestsSource

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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 1, 2026. · Read our editorial policy