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Test Code TESTOS FR TESTOSTERONE, FREE LC/MS FEMALES, CHILDREN AND INDIVIDUALS ON TESTOSTERONE SUPPRESSING THERAPY

Important Note

Provides a calculated value for free testosterone concentration using total testosterone measured by mass spectrometry. May be used to evaluate hyperandrogenism in children and cisgender females, monitor testosterone-suppressing hormone therapies (eg, antiandrogens or estrogens), evaluate testosterone status in individuals with protein-binding abnormalities, or evaluate hypogonadism in cisgender males.

Additional Codes

ARUP 81059

Specimen Type

Blood

Preferred Collection Container

PST

Collection Instructions

Separate serum from cells ASAP or within 2 hours of collection and transfer 1 mL serum or plasma to a transport tube

Collection Volume

2.0 mL

Minimum Collection Volume

1.6 mL

Testing Volume

0.8 mL

Rejection Criteria

EDTA Plasma

Specimen Storage and Stability

Ambient: 24 hours; Refrigerated: 1 week; Frozen: 6 months

Day(s) and Time(s) Performed

Sunday through Saturday

EPIC Code

LAB4591

Acceptable Collection Container

SST

R No-Gel

G No-Gel

GrnNaHep

Patient Preparation

Collect between 6-10 a.m

Transport

Refrigerated

STAT Availability

No

Turn Around Time

2-6 days

Lab Department

Referred Testing

CPT

84402

Methodology

Quantitative High Performance Liquid Chromatography-Tandem Mass Spectrometry / Electrochemiluminescent Immunoassay (ECLIA) / Calculation. Total testosterone and SHBG are measured and free testosterone is estimated from these measurements.