How long do I need to fast before a BMP test?

Most laboratories require fasting for 8-12 hours before the BMP test to ensure accurate glucose measurements. This means avoiding all food and beverages except water during this period. The fasting requirement is primarily for the glucose component of the panel, as eating can significantly affect blood sugar levels.

What's the difference between a BMP and a Comprehensive Metabolic Panel (CMP)?

A BMP includes 8 tests focused on kidney function, blood sugar, and electrolytes. A CMP includes all 8 BMP tests plus 6 additional tests that measure liver function and proteins (albumin, total protein, and liver enzymes). The CMP provides a more comprehensive overview of metabolic health but costs more than the focused BMP.

Can medications affect my BMP results?

Yes, various medications can influence BMP results. Diuretics may affect electrolyte levels, blood pressure medications can impact kidney function markers, and corticosteroids may elevate glucose levels. It's important to continue taking prescribed medications but inform your healthcare provider about all medications when interpreting results.

How often should I get a BMP test?

For healthy adults, a BMP is typically performed annually as part of routine health screenings. However, individuals with diabetes, kidney disease, high blood pressure, or those taking certain medications may need testing every 3-6 months. Your healthcare provider can recommend the appropriate testing frequency based on your health status.

What should I do if my BMP results are abnormal?

Abnormal BMP results don't automatically indicate a serious health problem, as many factors can influence test outcomes. If results are outside normal ranges, your healthcare provider may recommend repeat testing, additional tests, or evaluation of symptoms and medical history. Single abnormal results often require follow-up testing for confirmation before any treatment decisions are made.

Can I exercise before a BMP test?

It's generally recommended to avoid vigorous exercise for 24 hours before a BMP test, as intense physical activity can temporarily affect some test results, particularly creatinine levels. Light activities like walking are usually acceptable, but discuss any concerns about exercise restrictions with your healthcare provider or the testing laboratory.

General Wellness

Basic Metabolic Panel (BMP)

Measures eight key substances in blood to assess kidney function, blood sugar levels, electrolyte balance, and overall metabolism.

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What this test measures

A Basic Metabolic Panel (BMP) measures eight substances in the blood that together paint a clear picture of kidney performance, blood sugar regulation, and electrolyte balance. It is a streamlined version of the broader CMP, focusing on the markers most relevant to metabolism and fluid status.

The panel reports glucose (a key indicator of how the body handles blood sugar), calcium, and a group of electrolytes: sodium, potassium, chloride, and carbon dioxide (bicarbonate). It also includes creatinine and blood urea nitrogen (BUN), two waste products the kidneys filter out of the bloodstream. Electrolytes are critical for nerve signaling, muscle contraction, and maintaining the body's acid-base equilibrium. Healthcare providers order the BMP for routine wellness screenings, to monitor patients on certain medications, and to track the progress of conditions like diabetes or kidney disease.

What's included

Glucose (blood sugar)

Blood Urea Nitrogen (BUN)

Creatinine

BUN/Creatinine Ratio

Sodium

Potassium

Chloride

Carbon Dioxide (CO2)

Who should consider this test

You might consider this test if you are experiencing any of the following:

Individuals having routine health screenings or annual wellness exams
Those with symptoms such as fatigue, confusion, dehydration, muscle weakness, or frequent urination
Patients taking medications that may affect kidney or electrolyte levels, such as diuretics or blood pressure medications
People with diabetes who need regular monitoring of blood sugar levels
Individuals with kidney disease, high blood pressure, or other chronic conditions requiring metabolic monitoring
Those experiencing general symptoms that could indicate metabolic disorders or electrolyte imbalances

What to expect

Preparation

Fasting for 8-12 hours before the test is typically required for accurate glucose measurements. This means not eating or drinking anything except water during this period. Patients should continue taking prescribed medications unless specifically instructed otherwise by their healthcare provider.

Sample Type

A small blood sample is collected from a vein in the arm using a standard needle and collection tube. The procedure is quick and routine.

Collection

A healthcare professional will clean the arm area, insert a needle to draw blood into collection tubes, and apply a bandage. The entire process typically takes just a few minutes with minimal discomfort.

Turnaround

Results are usually available within 1-3 business days after sample collection. Some laboratories may provide results as quickly as 24-48 hours.

Understanding your results

Each of the eight values in the BMP is presented alongside a reference range that represents the expected results for healthy individuals. A single out-of-range number does not necessarily point to a medical condition; recent meals, hydration level, medications, and time of day can all influence results. Healthcare providers interpret BMP findings within the broader context of symptoms, medical history, and any other diagnostic information available before deciding whether additional evaluation is needed.

Population	Reference Range	Notes
Adults	Glucose: 74-99 mg/dL, Calcium: 8.5-10.2 mg/dL, BUN: 7-21 mg/dL	Reference ranges may vary slightly between laboratories

Reference ranges shown are general guidelines. Your lab report will include the specific reference range used by the laboratory that processed your sample, which is the authoritative range for interpreting your results.

What does a “Low” result mean?

Low results can also indicate health concerns that need attention. Hypoglycemia is less frequently observed but may result from conditions such as insulinoma, hypopituitarism or insulin-induced hypoglycemia. Low electrolyte levels might suggest dehydration, certain medications effects, or underlying conditions affecting fluid and mineral balance. Additional testing may be needed to determine the underlying cause of abnormal results.

What does a “High” result mean?

Elevated results may indicate various conditions depending on which marker is affected. High glucose levels may be a sign of diabetes, while high levels of BUN and creatinine could mean the kidneys aren't working well. If calcium is high, there might be a liver, kidney, or thyroid problem. Abnormal electrolyte levels may suggest dehydration, kidney disease, or other metabolic disorders that require further evaluation.

Privacy & confidentiality

All test orders are authorized and results reviewed by an independent, board-certified physician who is not the patient's personal doctor. Your Basic Metabolic Panel results are completely confidential and protected by strict medical privacy laws. When you order this test through LevelPanel, your results are not reported to your doctor unless you specifically choose to share them. The test results are not part of your medical records and will not appear on insurance statements or explanation of benefits (EOB) forms. Your lab results are securely delivered to you through our patient portal, ensuring that sensitive health information remains private. No doctor visit is required to order this test, giving you complete control over your health screening. Employers, insurance companies, and other third parties cannot access your results without your explicit consent. This privacy protection allows you to monitor your metabolic health discreetly and make informed decisions about when and how to share results with healthcare providers.

Frequently asked questions

Related tests

Comprehensive Metabolic Panel (CMP)

Includes all BMP tests plus liver function markers for more comprehensive metabolic assessment

View Test

Glucose Test

Focuses specifically on blood sugar levels if diabetes screening is the primary concern

View Test

Kidney Function Panel

Provides detailed assessment of kidney health with additional markers beyond BMP

View Test

Electrolyte Panel

Focuses on electrolyte balance when fluid and mineral status is the main concern

View Test

Last reviewed: April 2026

CPT Code: 80048

This test may not be available in: NY, NJ, RI

This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.

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Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.

This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.

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