Alpha Subunit
Test code
CPT code(s)*
Test resources
Test FAQ
Details
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.
Methodology
Electrochemiluminescence (ECLIA)
Assay category
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.
Alternative name(s)
Gonadotropin Alpha Subunit,Glycoprotein Alpha Subunit,Alpha Subunit of Pituitary,Pituitary Glycoprotein Hormone Alpha Subunit,Alpha Subunit of the Gonadotropin
Specimen requirements | |
|---|---|
| Patient preparation | None Specified |
| Preferred specimen(s) | 1 mL serum |
| Minimum volume | 0.5 mL |
| Transport container | Transport tube |
| Transport temperature | Room temperature |
| Specimen stability | Room temperature: 7 days Refrigerated: 10 days Frozen: 28 days |
| Reject criteria | Gross hemolysis • Plasma • Grossly icteric |
Reference Range(s)
| Males | 0.1-0.5 ng/mL | |||||
| Premenopausal Females | 0.1-0.6 ng/mL | |||||
| Postmenopausal Females | 0.1-1.5 ng/mL | |||||
| Pregnancy (1st and 2nd Trimesters) | 35.0-186.0 ng/mL | |||||
| Hypothyroidism | 0.2-3.2 ng/mL | |||||
This test measures the free 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.
Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
*The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.
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