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Laboratory:

Clinical Biochemistry (SENDOUTS)

Test Name:

TESTOSTERONE, TOTAL & FREE - (S)

Test Code: MIS8

Clinical Information:

Description: Second or third level test for evaluation of testosterone status. It may be useful in cases of abnormal sex hormone binding globulin (SHBG) or assessing circulating testosterone in females with symptoms and signs of hyperandrogenism with normal testosterone levels.
It may also be used when testosterone immunoassay results appear inconsistent with the clinical assessment.

The preferred test for assessment of active testosterone is Testosterone, Total, Bioavailable & Free (https://apps.sbgh.mb.ca/labmanual/test/view?seedId=20688).

ALL requests for this test require the Biochemistry Test Approval Form to be completed.
Patient preparation instructions: Fasting is preferred, but not required.

Collection Devices:

Preferred Device:

1 - Serum Tube(s), NO GEL - Full Tube Collection

Serum Tube(s), NO GEL - Full Tube Collection
Manufacturer: Becton Dickinson

Catalogue #: 366430

Serum GEL tubes are not acceptable.

Specimen Required:

Serum: 2.5 mL

Pediatric Serum: 2.0 mL

Collection Information: Collect morning specimen (6 AM-10 AM).
Specimen Stability:
Refrigerated: 14 days
Frozen: 2 months

Referral:

Serum: 2.0 mL

Shipping & Storage: Store and ship frozen. Avoid repeated freeze-thaw cycles.
Referred Out Location:
Specimen referred from HSC-MS5 to:
Mayo Clinic Laboratories
3050 Superior Dr. NW
Rochester, MN 55901
Phone: 800-533-1710

Test ID: TGRP

Requisition:

_SH Specialized Endocrinology Requisition (R250-10-77)

Reference Values:

Please see Mayo Clinical Laboratory reference values (add link:
https://www.mayocliniclabs.com/test-catalog/overview/8508#Clinical-and-Interpretive

Method of Analysis: Free testosterone: Equilibrium Dialysis / LC-MS/MS
Total testosterone: LC-MS/MS

Availability:

Within 2 Weeks