Biomarkers · Chemical
Testosterone,Free
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
- ng/dL
- LOINC codes
- 2991-8
- Tests that measure Testosterone,Free
- Labcorp 11, Quest Diagnostics 2
Ranges
Each lab publishes a reference range for the population groups it tests, usually the middle 95% of results. These intervals describe that population, not an optimal or healthy target. How ranges differ
Quest Diagnostics, Testosterone Free, Calculation 18944
| Provider context | Male (pg/mL) | Female (pg/mL) |
|---|---|---|
| <1 Year | Not established | Not established |
| 1-11 Years | ≤1.3 | ≤1.5 |
| 12-13 Years | ≤64.0 | ≤1.5 |
| 14-17 Years | 4.0-100.0 | ≤3.6 |
| 18-69 Years | 46.0-224.0 | 0.2-5.0 |
| 70-89 Years | 6.0-73.0 | 0.3-5.0 |
| >89 Years | Not established | Not established |
Tests
Check the catalog code, specimen, method and preparation for every test that measures Testosterone,Free. Select up to five tests to compare them side by side.
Labcorp 11 tests
Single-analyte tests
Testosterone, Free, Direct 144980
Serum · Fasting not stated · Turnaround 4 - 6 days
Labcorp catalog pageMethod and collection
- Method
- Direct analog enzyme immunoassay (EIA)
- Collection
- If a red-top tube is used, transfer separated serum to a plastic transport tube.
- Reference notes
- See table. Gender/Age (y) Range (pg/mL) Male 0 to 19 Not established 20 to 29 9.3−26.5 30 to 39 8.7−25.1 40 to 49 6.8−21.5 50 to 59 7.2−24.0 >59 6.6−18.1 Female 0 to 19 Not established >19 0.0−4.2
Panels that include this biomarker
Testosterone, Free, Direct With Total Testosterone 140103
2 analytes · Serum · Fasting not stated · Turnaround 4 - 7 days
Labcorp catalog pageMethod and collection
- Method
- Free: Direct analog enzyme immunoassay (EIA); Total: electrochemiluminescence immunoassay (ECLIA)
- Collection
- If a red-top tube is used, transfer separated serum to a plastic transport tube.
Testosterone, Free, Direct With Total Testosterone, LC/MS-MS 070195
2 analytes · Serum · Fasting not stated · Turnaround 4 - 6 days
Labcorp catalog pageMethod and collection
- Method
- Free: Direct analog enzyme immunoassay (EIA); 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.
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
Quest Diagnostics 2 tests
Single-analyte tests
Testosterone Free, Calculation 18944
Serum · Fasting not stated · Turnaround Set up: Mon-Fri
Quest Diagnostics catalog pageMethod and collection
- Method
- Chromatography/Mass Spectrometry • Calculation (CALC) • Immunochemiluminescence Assay (ICMA)
- Collection
- Specify age and sex on test request form. Red-top tube (no gel): Allow blood to clot at room temperature. Centrifuge to separate the serum from the cells and immediately pour serum into a plastic transport tube. Serum separator tube: Allow blood to clot at room temperature, centrifuge, and remove serum from the gel immediately (not to exceed 48 hours) by pouring serum into a plastic transport tube.
Panels that include this biomarker
Testosterone, Free (Dialysis), Total (MS) and Sex Hormone Binding Globulin 37073
3 analytes · Serum · Fasting not stated
Quest Diagnostics catalog pageMethod and collection
- Method
- Chromatography/Mass Spectrometry • Equilibrium Dialysis • Calculation (CALC) • Immunoassay (IA)
- Collection
- Specify age and sex on test request form. Red-top tube (no gel): Allow blood to clot at room temperature. Centrifuge to separate the serum from the cells and immediately pour serum into a plastic transport tube. Serum separator tube: Allow blood to clot at room temperature, centrifuge, and remove serum from the gel immediately (not to exceed 48 hours) by pouring serum into a plastic transport tube. Administration of STRENSIQ may interfere in certain assays and may falsely elevate values. For patients receiving STRENSIQ, consideration should be given to using alternate methods.
- Reference notes
- See Laboratory Report
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11 tests: codes, specimens, methods, preparation and reference intervals.
Quest Diagnostics test catalog
2 tests: codes, specimens, methods, preparation and reference intervals.
MedlinePlus, National Library of Medicine
The description at the top of this page.
LOINC 2991-8
Regenstrief Institute codes that identify the same result across labs.
Search ClinicalTrials.gov for Testosterone,Free
Registered studies that measure Testosterone,Free, 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.
Interpret your own results with a licensed clinician, or track your lab history and health goals in Aumnivida.
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