Chemistry Screen

Test Overview

A chemistry screen is a blood test that measures the levels of several substances in the blood (such as electrolyteselectrolytes). A chemistry screen tells your doctor about your general health, helps look for certain problems, and finds out whether treatment for a specific problem is working.

Some chemistry screens look at more substances in the blood than others do. For example, a comprehensive metabolic panel (CMP) looks at more substances in the blood than a basic metabolic panel (BMP). The type of chemistry screen you have done depends on what information your doctor is looking for.

A chemistry screen may include tests for:

Albumin.
Alkaline phosphatase.
Alanine aminotransferase (ALT).
Aspartate aminotransferase (AST).
Bilirubin (total and direct).
Blood glucose.
Blood urea nitrogen.
Calcium (Ca).
Carbon dioxide (bicarbonate).
Chloride (Cl).
Creatinine and creatinine clearance.
Potassium (K).
Sodium (Na).
Total serum protein.

Why It Is Done

A chemistry screen may be done:

As part of a routine physical examination.
To help you and your doctor plan changes in your meal plan or lifestyle.
To look for problems, such as a low or high blood glucose level that may be causing a specific symptom.
To follow a specific health condition and check how well a treatment is working.
Before you have surgery.

How To Prepare

How you prepare for a chemistry screen depends on what your doctor is looking for in the test.

You may be instructed not to eat or drink anything except water for 8 to 12 hours before having your blood drawn. This is called a "fasting blood test." Fasting isn't always needed. But it may be recommended.
In most cases, you are allowed to take your medicines with water the morning of the test.

Information about Chemistry Screen

How It Is Done

How It Feels

Risks

Results

Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.

Many conditions can change chemistry screen test levels. Your doctor will talk with you about any abnormal results that may be related to your symptoms and medical history.

Current as of: April 30, 2024

Author: Ignite Healthwise, LLC StaffIgnite Healthwise, LLC Staff

Clinical Review BoardClinical Review Board
All Ignite Healthwise, LLC education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

This information does not replace the advice of a doctor. Ignite Healthwise, LLC, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of UseTerms of Use. Learn how we develop our contenthow we develop our content.

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