UCSF Departments of Pathology and Laboratory Medicine | Lab Manual | Laboratory Test Database | Testosterone, Free (includes Total Testosterone)

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Testosterone, Free (includes Total Testosterone)

Item

Value

Approval req'd?

Available Stat?

Test code

FTST

Test group

Testosterone

Performed by

Quest

Sendout?

Yes

Method

LC/MS/MS, Tracer Equilibrium Dialysis, Calculation

Container type

Red top (Gold top unacceptable )

Amount to Collect

2 mL blood

Sample type

Serum

Preferred volume

1 mL serum

Min. Volume

0.4 mL serum

UCSF Rejection Criteria

Collected in Gold top. Grossly hemolyzed samples.

Processing notes

Refrigerate serum. Specify age and sex on test request form. Order Quest # 36170

Units

ng/dL and pg/mL

Normal range

Testosterone, Total:

Age	Males	Females
Cord Blood	17-61 ng/dL	16-44 ng/dL
1-10 days	≤ 187 ng/dL	≤ 24 ng/dL
1-3 months	72-344 ng/dL	≤ 17 ng/dL
3-5 months	≤ 201 ng/dL	≤ 12 ng/dL
5-7 months	≤ 59 ng/dL	≤ 13 ng/dL
7-12 months	≤ 16 ng/dL	≤ 11 ng/dL
1-5.9 years	≤ 5 ng/dL	≤ 8 or less
6-7.9 years	≤ 25 ng/dL	≤ 20 or less
8-10.9 years	≤ 42 ng/dL	≤ 35 or less
11-11.9 years	≤ 260 ng/dL	≤ 40 ng/dL
12-13.9 years	≤ 420 ng/dL	≤ 40 ng/dL
14-17.9 years	≤ 1000 ng/dL	≤ 40 ng/dL
18-69 years	250 - 1100 ng/dL	2 - 45 ng/dL
70-89 years	90 - 890 ng/dL	2 - 40 ng/dL

Pediatric Reference Ranges by Pubertal Stage :

Stages	Males	Females
I	≤ 5 ng/dL	≤ 8 ng/dL
II	≤ 167 ng/dL	≤ 24 ng/dL
III	21-719 ng/dL	≤ 28 ng/dL
IV	25-912 ng/dL	≤ 31 ng/dL
V	110-975 ng/dL	≤ 33 ng/dL

Testosterone, Free:

Age	Males	Females
5-9.9 years	≤ 5.3 pg.mL	0.2-5.0 pg.mL
10-13.9 years	0.7-52.0 pg/mL	0.1-7.4 pg/mL
18-69 years	35.0-155.0 pg/mL	0.1-6.4 pg/mL
70-89 years	30.0-135.0 pg/mL	0.2-3.7 pg/mL
14-17.9 years	18.0-111.0 pg/mL	0.5-3.9 pg/mL

Synonyms

Free testosterone

Stability

Room temperature 1 week, refrigerated 1 week, frozen at -20C 2 years.

Turn around times

Test run daily. Turnaround time: 6-8 days.

Additional information

Includes determination of Total Testosterone.

To convert ng/L to pmol/L (SI units) multiply by 3.47.

Newborn and 5-7 months old reference ranges are taken from Tietz, NW, Clinical Guide to Laboratory Tests, 2nd ed., 1990, Saunders, Philadelphia.

CPT coding

84402-90, 84403-90

LOINC code

2991-8

Last Updated

12/15/2010 2:23:48 PM

Entry Number

891

If you have additional questions regarding this test, please call: 415-353-1667

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Testosterone, Free (includes Total Testosterone)