Biomarkers · Chemical
% Free Testosterone
A testosterone levels test measures the amount of the hormone testosterone in a sample of your blood. Hormones are chemical messengers in your bloodstream that control the actions of certain cells or organs.
Testosterone Levels Test, MedlinePlus, National Library of Medicine
- Primary unit
- %
- LOINC codes
- 15432-8
- Tests that measure % Free Testosterone
- Labcorp 6
Tests
Check the catalog code, specimen, method and preparation for every test that measures % Free Testosterone. Select up to five tests to compare them side by side.
Labcorp 6 tests
Panels that include this biomarker
Testosterone, Free, Equilibrium Ultrafiltration With Total Testosterone 081786
3 analytes · Serum · Fasting not stated · Turnaround 2 - 4 days
Labcorp catalog pageMethod and collection
- Method
- Free: equilibrium ultrafiltration; total: electrochemiluminescence immunoassay (ECLIA)
- Collection
- Separate serum from cells. If a red-top tube is used, transfer separated serum to a plastic transport tube.
- Reference notes
- See tables.1 Free Testosterone Age | Male (ng/dL) | Female (ng/dL) Cord blood | 0.50−2.20 | 0.40−1.60 1 to 15 d | 0.15−3.10 | 0.05−0.25 1 to 2 m | 0.33−0.80 | 0.01−0.13 3 to 5 m | 0.07−1.40 | 0.03−0.11 6 to 7 m | 0.04−0.48 | 0.02−0.06 6 to 9 y | 0.01−0.32 | 0.01−0.09 10 to 11 y | 0.06−0.57 | 0.10−0.52 12 to 14 y | 0.14−15.60 | 0.10−0.52 15 to 17 y | 8.00−15.90 | 0.10−0.52 Adults | 5.00−21.00 | 0.10−0.85 Percentage of Total Testosterone Age | Male (%) | Female (%) Cord blood | 2.00−4.40 | 2.00−3.90 1 to 15 d | 0.90−1.70 | 0.80−1.50 1 to 2 m | 0.40−0.80 | 0.40−1.10 3 to 5 m | 0.40−1.10 | 0.50−1.00 6 to 7 m | 0.40−1.00 | 0.50−0.80 6 to 9 y | 0.90−1.70 | 0.90−1.40 10 to 11 y | 1.00−1.90 | 1.00−1.90 12 to 14 y | 1.30−3.00 | 1.00−1.90 15 to 17 y | 1.80−2.70 | 1.00−1.90 Adults | 1.50−4.20 | 0.50−2.80
Testosterone, Free, Equilibrium Ultrafiltration With Total Testosterone, LC/MS-MS 070038
3 analytes · Serum · Fasting not stated · Turnaround 4 - 6 days
Labcorp catalog pageMethod and collection
- Method
- Free: equilibrium ultrafiltration; total: liquid chromatography/tandem mass spectrometry (LC/MS-MS)
- Collection
- Serum should be transferred from cells within one hour of collection and transferred to a plastic transport tube.
- Reference notes
- See table.1 Free Testosterone Age | Male (ng/dL) | Female (ng/dL) Cord blood | 0.50−2.20 | 0.40−1.60 1 to 15 d | 0.15−3.10 | 0.05−0.25 1 to 2 m | 0.33−0.80 | 0.01−0.13 3 to 5 m | 0.07−1.40 | 0.03−0.11 6 to 7 m | 0.04−0.48 | 0.02−0.06 6 to 9 y | 0.01−0.32 | 0.01−0.09 10 to 11 y | 0.06−0.57 | 0.10−0.52 12 to 14 y | 0.14−15.60 | 0.10−0.52 15 to 17 y | 8.00−15.90 | 0.10−0.52 Adults | 5.00−21.00 | 0.10−0.85 Percentage of Total Testosterone Age | Male (%) | Female (%) Cord blood | 2.00−4.40 | 2.00−3.90 1 to 15 d | 0.90−1.70 | 0.80−1.50 1 to 2 m | 0.40−0.80 | 0.40−1.10 3 to 5 m | 0.40−1.10 | 0.50−1.00 6 to 7 m | 0.40−1.00 | 0.50−0.80 6 to 9 y | 0.90−1.70 | 0.90−1.40 10 to 11 y | 1.00−1.90 | 1.00−1.90 12 to 14 y | 1.30−3.00 | 1.00−1.90 15 to 17 y | 1.80−2.70 | 1.00−1.90 Adults | 1.50−4.20 | 0.50−2.80
Testosterone, Free, Mass Spectrometry/Equilibrium Dialysis (Endocrine Sciences) 500726
3 analytes · Serum · Fasting not stated · Turnaround 6 - 10 days
Labcorp catalog pageMethod and collection
- Method
- Testosterone: high-pressure liquid chromatography (HPLC)/tandem mass spectrometry; free testosterone: equilibrium dialysis
- Collection
- Serum must be separated from cells within 45 minutes of venipuncture. Send serum in a plastic transport tube. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested .
- Reference notes
- See tables. Testosterone Expected Values Age Male (ng/dL) Female (ng/dL) Premature Infants 26 to 28 wk, day 4 59−125 5−16 31 to 35 wk, day 4 37−198 5−22 Full-term Infants Newborns, 1 to 7 m 75−400 20−64 Prepubertal Children 1 to 10 y <2.5−10 1 to 9 y <2.5-10 Adults >18 y 264−916 Premenopausal 10−55 Postmenopausal 7−40 Tanner Stage - Pubertal Ages Tanner Stage Male Female Age (y) Testosterone (ng/dL) Age (y) Testosterone (ng/dL) I <9.8 <2.5−10 <9.2 <2.5−10 II 9.8−14.5 18−150 9.2−13.7 7−28 III 10.7−15.4 100−320 10.0−14.4 15−35 IV 11.8−16.2 200−620 10.7−15.6 13−32 V 12.8−17.3 350−970 11.8−18.6 20−38 Free Testosterone Expected Values Age Male Female % Free pg/mL % Free pg/mL Full-term Infants 1 to 15 d 0.9−1.7 1.5−31 0.8−1.5 0.5−2.5 1 to 2 m 0.4−0.8 3.3−18 0.4−1.1 0.1−1.3 3 to 4 m 0.4−1.1 0.7−14 0.5−1.0 0.3−1.1 5 to 6 m 0.4−1.0 0.4−4.8 0.5−0.8 0.2−0.6 Prepubertal Children 1 to 10 y 0.4−0.9 0.15−0.6 Same as males Puberty: Comprehensive values for free testosterone by dialysis for both males and females throughout puberty are currently unavailable. Male Female % Free pg/mL % Free pg/mL Adults 1.5−3.2 52−280 0.8−1.4 1.1−6.3
Testicular Function Profile II 035113
4 analytes · Serum · Fasting not stated · Turnaround 4 - 5 days
Labcorp catalog pageMethod and collection
- Method
- See individual tests.
- Collection
- If a red-top tube is used, transfer separated serum to a plastic transport tube.
Hirsutism Test Group I (Endocrine Sciences) 500066
5 analytes · Serum · Fasting not stated · Turnaround 7 - 8 days
Labcorp catalog pageMethod and collection
- Method
- See individual assays.
- Collection
- Serum must be separated from cells within 45 minutes of venipuncture. Send serum in a plastic transport tube. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested .
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6 tests: codes, specimens, methods, preparation and reference intervals.
MedlinePlus, National Library of Medicine
The description at the top of this page.
LOINC 15432-8
Regenstrief Institute codes that identify the same result across labs.
Search ClinicalTrials.gov for % Free Testosterone
Registered studies that measure % Free Testosterone, on the U.S. National Library of Medicine registry.
Verify these ranges and sources
We compile this page from named laboratory catalogs, guidelines and studies. Labs calculate reference intervals from the people they test, for one assay method and one population group, so an interval describes that population rather than an optimal target.
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