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Testosterone, Free (includes Total Testosterone), Adult

Item Value
Test Update Information Effective June 1, 2016 free testosterone testing will now be performed in-house at China Basin Chemistry. Results may change by up to 15% compared to those obtained using the previous method at Quest.
Available Stat? No
Test code FTCA
Test group Testosterone
Performed by China Basin Chemistry
In House Availability Test run on Monday and Thursday.
Method Total testosterone immunoassay, free testosterone calculation
Container type Red top (Gold top NOT acceptable )
Amount to Collect 2 mL (blood)
Sample type Serum
Preferred volume 1 mL (serum)
Min. Volume 0.75 mL (serum)
UCSF Rejection Criteria Collected in Gold top
Processing notes Refrigerate serum.
Units pg/mL (free) and ng/dL (total)
Normal range Testosterone, Total:
Males ≥ 18 years 240-871 ng/dL
Females ≥ 18 years 9-55 ng/dL

Testosterone, Free:
Age Males Females
18-69 years 35-155 pg/mL 0.1-6.4 pg/mL
70-89 years 30-135 pg/mL 0.2-3.7 pg/mL

Synonyms Free testosterone
Stability Refrigerated for 2 weeks, frozen at -20oC for 3 years.
Turn around times Test run on Monday and Thursday. Turnaround time 1-5 days
Additional information Reference ranges adopted from Quest Diagnostics based on correlation studies comparing our method with the Quest method and by in-house testing of 24 normal male and 31 normal female volunteers in the UCSF Laboratory.

Includes determination of total testosterone.

Free: To convert pg/mL to pmol/L (SI units) multiply by 3.467.

Total: To convert ng/dL to nmol/L (SI units) multiply by 0.0347.
CPT coding 84402 and 84403
LOINC code 2991-8 and 2986-8
Last Updated 6/2/2016 1:16:11 PM
Entry Number 1732
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