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Testosterone,Total

Item Value
Test Update Information Method changed from Siemens Centaur XP platform to Abbott Architect i2000 platform on November 17, 2014.

The new testosterone immunoassay on the Architect i2000 platform correlates better than the older Siemens Centaur XP immunoassay in comparisons with the UCSF LC tandem mass spectrometry testosterone assay. The new Architect immunoassay also has better low end sensitivity than the previous Siemens Centaur immunoassay and gives results that are approximately 27% higher than the previous Siemens Centaur immunoassay.

Also, please note that the reference ranges have changed.
Approval req'd? No
Available Stat? No
Test code TTES
Test group Testosterone
Performed by China Basin Chemistry
In House Availability Monday and Thursday (day shift)
Method Two Step Chemiluminescent Microparticle Immunoassay on Abbott Architect i2000 (if needed, reflex to LC-MS/MS)
Container type Red top
Amount to Collect 2 mL blood
Sample type Serum
Preferred volume 1 mL serum
Min. Volume 0.5 mL serum
Processing notes Refrigerate
Units ng/dL
Normal range
Males ≥ 18 years 240-871 ng/dL
Females ≥ 18 years 9-55 ng/dL


Reference ranges for females adapted from ARUP Laboratories & vendor performed studies and verified by in-house testing of 20 normal female volunteers in the UCSF laboratory.

Reference ranges for males adapted from vendor performed studies and verified by in-house testing of 22 normal male volunteers in the laboratory.
Turn around times 1-4 days
Reflex? Lab will automatically perform testosterone testing on LC-MS/MS for all samples with results <25 ng/dL from Architect i2000 method.
Additional information This assay is performed in-house and is suitable for use in adult patients to assess general endocrine function.

Results <25 ng/dL will be reflexed to LC-MS/MS method.

To convert ng/dL to nmol/L (SI units) multiply by 0.0347.

For pediatric patients, see entry for Testosterone, Ultrasensitive.
LOINC code 49041-7
Last Updated 11/26/2014 8:19:48 PM
Entry Number 890
Lab Procedure Link Click here for procedure
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