Laboratory: Clinical Biochemistry
Test Name:
TESTOSTERONE, TOTAL & FREE - (S)
Test Code: MIS8
Clinical Information:
Test Indications: This test is used as a second or third order test for evaluating testosterone status (eg. when abnormalities of sex homone-binding globulin are present). It is also used when testosterone immunoassay results appear inconsistent with the clinical assessment.
Testosterone by LC-MS/MS 
Free testosterone by equilibrium dialysis.
Collection Devices:
Serum GEL tubes are not acceptable.
Morning (0700 – 1000h) fasting samples, collected on two or more occasions to minimize biological variability, are recommended for the assessment of male hypogonadism.
Specimen Required:


Serum: 2.5 mL
Pediatric Serum: 2.0 mL
Referral:
Requisition:
Reference Values:
A descriptive report will be sent.
Availability:
Within 2 Weeks
Orderable by physicians specializing in endocrinology -authorized physicians only.
See Also:
More Information:
Store and ship refrigerated temperature (preferred) or frozen to Mayo Medical Laboratories.  Test ID:  TGRP (8508).