Testosterone, Free

Last Modified: 9/26/2023 10:21:10 AM


Medical Necessity Documentation:  
Client Notes:  
Patient Preparation:  
Specimen Requirements:

2.8 mL Serum from a Red Top Tube in a Plastic Vial
Collection Instructions: Please specify age and sex on test request form.
Minimum Volume: 1.3 mL Serum
Transport & Storage: Temperature/Stability:

7 days Ambient (transport)
7 days Refrigerated
2 years Frozen
Rejection Criteria: Hemolysis, Icteria, Lipemia; Serum Separator Tubes (SST)
Reference Range:
Adult Males (pg/mL) Females (pg/mL)
18-69 Years 46.0-224.0 0.2-5.0
70-89 Years 6.0-73.0 0.3-5.0
     
Pediatric Males (pg/mL) Females (pg/mL)
<1 Year Not available Not available
1-10.9 Years ≤1.3 ≤1.5
11-11.9 Years ≤1.3 ≤1.5
12-13.9 Years ≤64 ≤1.5
14-17.9 Years 4.0-100.0 ≤3.6
Pediatric data from Clin Endocrinol (1989) 31:201-207 and Acta Endocrinologica (1985) 109:276-280.
The concentration of free testosterone is derived from a mathematical model using total testosterone by LC/MS/MS, sex hormone binding globulin, and albumin.
Critical Ranges:  
Test Comments:  
Methodology: Immunochemiluminometric Assay • Liquid Chromatography/Tandem Mass Spectrometry • Spectrophotometric
Clinical Significance: Test is helpful in assessing testicular function in males and managing hirsutism and virilization in females.
Documentation:  
Custom Panel: No

PRODUCTION SCHEDULE

Turn Around Time: 2 to 4 days
Days Performed: Monday, Tuesday, Wednesday, Thursday, Friday
Sites Performed: Quest - Chantilly
PHL Test Code: TSFR
EPIC Test Code: LAB2565
Send Out Test Code: 18944
Alternate Test Names: Testosterone, Free Direct
Included Tests:  
CPT Coding: 84402

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