Primary Care

Test Code: 745

CPT Code(s): 84144

Methodology: Immunoassay

Clinical Significance: Levels increase sharply during the luteal phase of the menstrual cycle. The level increases from 9 to 32 weeks of pregnancy.

Alternative Name(s): N/A

Test Code: 7137

CPT Code(s): 83001, 83002

Methodology: Immunoassay

Sed Rate by Modified Westergren, Manual

Test Code: 29891
CPT Code: 85651
Alternative Name(s): Sed rate; ESR, Erythrocyte sedimentation rate; Westergren sed rate
Methodology: Modified Westergren
Clinical Significance: Useful in differentiating inflammatory and neoplastic diseases and as an index of disease serverity.

Test Code: 483

CPT Code(s): 82947

Methodology: Spectrophotometry (SP)

Limitations: Glucose levels may be depressed if sample is left to clot and not spun for an excessive length of time.

Test Code: 622

CPT Code(s): 83735

Methodology: Spectrophotometry (SP)

Clinical Significance: Magnesium measurements are used in the diagnosis and treatment of hypomagnesemia (abnormally low plasma levels of magnesium) and hypermagnesemia (abnormally high plasma levels of magnesium). Magnesium is decreased in chronic nephritis, acute pancreatitis, and alcoholic cirrhosis. It is increased in acute or chronic renal failure and Addison's Disease.

Alternative Name(s): MAG

Test code: 678

CPT code(s): 83935

Methodology: Freezing Point Depression

Clinical Significance: For assessing the concentrating ability of the kidney

Alternative Names: N/A

Test Code: 677

CPT Code(s): 83930

Supply: #T64 Red Serum (6mL, no gel)

Methodology: Freezing Point Depression

Clinical Significance: Serum osomolality is increased in hypernatremia, hyperglycemia, uremia, ethanol, methanol, or ethylene glycol overdoses, and in diabetes insipidus.

Additional names: N/A

Test Code: 8477

CPT Code(s): 82950

Methodology: Spectrophotometry (SP)

Clinical Significance: A value of 135 mg/dL or greater indicates the need for a full diagnostic, gestational glucose tolerance performed in the fasting state to determine if the patient has gestational diabetes.

Alternative Name(s): 1HR Gestational; 1HR Pregnancy Glucose; Gestational Glucose; Glucose OB; Gestational Glucose (1 Specimen); Glucose Gestational Screen; Glucose PG; Glucose 1RH 50gm Load

Test Code: 873

CPT Code(s): 84403

Supply: #T157 Red/Yellow SST 8mL

Methodology: Immunoassay

Limitations: Immunoassay does not provide sufficient sensitivity in detecting low concentrations among non-adults and women.

Test Code: 4420

CPT Code(s): 86140

Methodology: Nephelometry

Limitations: Oral contraceptives, IUDs, pregnancy, and menstruation may raise CRP levels. Levels are lowest during ovulation.