Alpha Subunit

Test Code

8658

CPT Codes
83520

Includes

This test measures the alpha subunit that is common to LH, FSH, TSH and hCG. These hormones are comprised of identical alpha subunits and unique beta subunits that confer biological specificity.

Preferred Specimen

1 mL serum

Minimum Volume

0.5 mL

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 10 days
Frozen: 28 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross hemolysis • Plasma • Grossly icteric

Methodology
Electrochemiluminescence (ECLIA)

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule

A.M. Tues, Fri

Report Available

3-7 days

Clinical Significance

This assay is useful in the diagnosis and management of various pituitary, placental, pancreatic and hCG-producing tumors. The assay can also be useful for investigations where alpha subunit is increased under various physiological stimuli, e.g., GnRH stimulation and TRH stimulation tests.

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.