Comprehensive metabolic panel
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|Comprehensive metabolic panel|
Computer screen report of a Comprehensive metabolic panel.
The comprehensive metabolic panel, or chemical screen, (CMP; CPT code 80053) is a panel of 14 blood tests which serves as an initial broad medical screening tool. The CMP provides a rough check of kidney function, liver function, and electrolyte and fluid balance, but it is far from perfect. Abnormal values from a Complete blood count may be a result of false positives and thus the CBC may need to be repeated for a patient (or replaced with a more specific test).
The CMP is an expanded version of the basic metabolic panel (BMP), which does not include liver tests. A CMP (or BMP) can be ordered as part of a routine physical examination, or may be used to monitor a patient with a chronic disease, such as diabetes mellitus or hypertension.
Previous names for the panel of tests have been Chem 12, Chemistry panel, Chemistry screen, SMA 12, SMA 20 and SMAC (Sequential Multiple Analysis - Computer). The tests are performed on machines based on the AutoAnalyzer invented in 1957.
Typically, the patient fasts for ten or twelve hours before the blood is drawn for the test--this is particularly important for getting a useful blood glucose measurement. CMPs are also frequently done in nonfasting patients, but the Glucose level in those cases is not as useful. The following tests are then performed:
These tests help screen for a wide variety of problems. The glucose test in particular helps screen for diabetes mellitus and pre-diabetes. The calcium test can indicate or monitor bone diseases or diseases of the parathyroid gland or kidneys. Calcium salts, Lithium, Thiazide diuretics, Thyroxine, and vitamin D can all increase levels and may interfere with this test.
Kidney function assessment
Electrolyte levels and the balance among them are tightly regulated by the body. Both individual values and ratios among the values are significant; abnormalities among either can indicate problems such as an electrolyte disturbance, acid-base imbalance, or kidney dysfunction.
Tests of protein levels in the blood help screen for both kidney and liver disorders.
Liver function assessment
- Alkaline phosphatase (ALP)
- Aspartate amino transferase (AST or SGOT)
- Alanine amino transferase (ALT or SGPT)
- "Comprehensive Metabolic Panel". Lab Tests Online. 2005-10-31. Retrieved 2008-09-22.
- "Calcium - blood test: MedlinePlus Medical Encyclopedia". Nlm.nih.gov. 2012-08-27. Retrieved 2012-09-14.