Testosterone, Total and Free

Testosterone, Total and Free is a topic covered in the Davis's Lab & Diagnostic Tests.

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General

Synonym/Acronym:
N/A

Common Use:
To evaluate testosterone to assist in identification of disorders related to early puberty, late puberty, and infertility while assessing gonadal and adrenal function.

Specimen:
Serum collected in a red- or red/gray-top tube. Plasma collected in green-top (heparin) tube is also acceptable.

Normal Findings:
(Method: HPLC/tandem MS for total and immunochemiluminometric assay [ICMA] for free testosterone)


Free Testosterone
AgeConventional UnitsSI Units (Conventional Units × 3.47)
1–12 yr
 Male and femaleLess than 2 pg/mLLess than 6.94 pmol/L
12–14 yr
 MaleLess than 60 pg/mLLess than 208 pmol/L
 FemaleLess than 2 pg/mLLess than 6.94 pmol/L
14–18 yr
 Male4–100 pg/mL13.88–347 pmol/L
 FemaleLess than 4 pg/mLLess than 13.88 pmol/L
Adult
 Male50–224 pg/mL173.5–777.28 pmol/L
 Female1–8.5 pg/mL3.47–29.5 pmol/L
Older adult
 Male5–75 pg/mL17.35–260.25 pmol/L
 Female1–8.5 pg/mL3.47–29.5 pmol/L

Total Testosterone
AgeConventional UnitsSI Units (Conventional Units × 0.0347)
Newborn
 Male17–61 ng/dL0.59–2.12 nmol/L
 Female16–44 ng/dL0.56–1.53 nmol/L
1–5 mo
 MaleLess than 300 ng/dLLess than 10.41 nmol/L
 FemaleLess than 20 ng/dLLess than 0.69 nmol/L
6–11 mo
 MaleLess than 40 ng/dLLess than 1.39 nmol/L
 FemaleLess than 9 ng/dLLess than 0.31 nmol/L
1–5 yr
 Male and femaleLess than 10 ng/dLLess than 0.35 nmol/L
6–7 yr
 MaleLess than 20 ng/dLLess than 0.69 nmol/L
 FemaleLess than 10 ng/dLLess than 0.35 nmol/L
8–10 yr
 Male2–25 ng/dL0.07–0.87 nmol/L
 Female1–30 ng/dL0.04–1 nmol/L
11–12 yr
 MaleLess than 350 ng/dLLess than 12.1 nmol/L
 FemaleLess than 50 ng/dLLess than 1.74 nmol/L
13–15 yr
 Male15–500 ng/dL0.52–17.35 nmol/L
 FemaleLess than 50 ng/dLLess than 1.74 nmol/L
Adult
 Male241–827 ng/dL8.36–28.7 nmol/L
 Female15–70 ng/dL0.52–2.43 nmol/L
Older adult
 Male300–720 ng/dL10.41–24.98
 Female5–32 ng/dL0.17–1.11
Post menopausal levels are about half the normal adult level for females; levels in women who are pregnant are 3 to 4 times the normal adult level for females who are not pregnant.

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Citation

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TY - ELEC T1 - Testosterone, Total and Free ID - 425041 Y1 - 2017 PB - Davis's Laboratory & Diagnostic Tests UR - https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425041/all/Testosterone__Total_and_Free ER -