Alternative Names SMAC7, sequential multichannel analysis with computer-7, SMA7
Definition The CHEM-7 is a set of seven tests that are performed on a sample of blood. The results give an overview of blood chemistry that is very useful to the healthcare provider.
CHEM-7 indicates the levels or concentrations in the blood of the key
electrolytes or minerals
enzymes
sugars
proteins and metabolites
or byproducts of chemical processes in the body.
Blood delivers nutrients to all of the body's cells and tissues. Blood carries waste products from these cells and tissues, as well. An analysis of blood chemistry can reveal a lot about problems in specific cells and tissues.
Who is a candidate for the test? This test is normally done to evaluate how a number of products, such as proteins, sugars and enzymes, are being used in the body. This test can help a healthcare provider diagnose diseases.
How is the test performed? To perform this set of tests, a blood sample is taken from a vein on the forearm or hand. First, the skin over the vein is cleaned with an antiseptic. Next, a strong rubber tube, or "tourniquet," is wrapped around the upper arm. This enlarges the veins in the lower arm by restricting blood flow through them. A fine needle is gently inserted into a vein, and the tourniquet is removed. Blood flows from the vein through the needle, and is collected into a syringe or vial for testing in the laboratory. After the needle is withdrawn, the puncture site is covered for a short time to prevent bleeding.
What is involved in preparation for the test? A person should request specific instructions from his or her healthcare provider prior to the CHEM-7 test.
What do the test results mean? The normal values for substances measured by CHEM-7 are as follows:
Blood urea nitrogen (BUN) = 7 to 20 mg/dl
Serum chloride = 101 to 111 mmol/liter
Carbon dioxide (CO2) = 20 to 29 mmol/liter
Creatinine = 0.8 to 1.4 mg/dl
Glucose test = 64 to 128 mg/dl
Serum potassium = 3.7 to 5.2 mEq/liter
Serum sodium = 136 to 144 mEq/liter
Abbreviations:
dl = deciliter
mg = milligram
mmol = millimole
mEq = milliequivalent
Author: Eva Martin, MD Reviewer: Eileen McLaughlin, RN, BSN Last Updated: 05/16/00 Contributors Potential conflict of interest information for reviewers available on request
