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Concept
Comprehensive metabolic panel
Summary
The comprehensive metabolic panel, or chemical screen (CMP; CPT code 80053), is a panel of 14 blood tests that serves as an initial broad medical screening tool. The CMP provides a rough check of kidney function, liver function, diabetic and parathyroid status, and electrolyte and fluid balance, but this type of screening has its limitations. Abnormal values from a CMP are often the result of false positives and thus the CMP may need to be repeated (or a more specific test performed), requiring a second blood drawing procedure and possibly additional expense for the patient, even though no disease is present. This test is also known as SMA12+2 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 performed on 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.
Serum glucose
Calcium
Blood urea nitrogen (BUN)
Creatinine
Electrolyte levels and the balance among them are tightly regulated by the body.
Official source
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