Testosterone, Bioavailable by Immunoassay, Adult Male TSTRB

Method(s) Chemiluminescent Immunoassay
Synonym Testosterone Weakly Bound
Components Total Testosterone, SHBG, Free Testosterone, Bioavailable Testosterone
Specimen Required
Collect

One 5 mL gold (SST) top tube. Heparinized plasma also acceptable.

Transport

1 mL serum 2-8ºC.

Remarks

Specimen should be collected between 6 and 10 am.

For females and children under 14 years, select LCMS-based assay for required sensitivity.

Stability

Ambient: 8 hours; Refrigerated: 2 days; Frozen: 1 month

Schedule Daily
Billing Code 1010465
CPTCode 84403 Total testosterone; 84270 SHBG
Notes

The concentration of free testosterone is derived from a mathematical expression based on the constants for the binding of testosterone to sex hormone binding globulin and albumin.

Preferred Specimen Collection Device(s)
Reference Interval
ComponentReference Interval
Testosterone Free, ImmunoassayMale:
14-15 years: 3-138 pg/mL
16-17 years: 38-173 pg/mL
18 years and older: 47-244 pg/mL
Testosterone, Total, ImmunoassayMale:
14 years and older: 175-781 ng/dL
Sex Hormone Binding GlobulinMale, adult:
13-90 nmol/L
Testosterone, Bioavailable, ImmunoassayMale:
14-15 years: 10-337 ng/dL
16-17 years: 35-509 ng/dL
18 years and older: 131-682 ng/dL
Testosterone, Percent FreeMale, adult:
1.6 - 2.9%
No Appointment Necessary
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12 Patient Service Centers in Central New York.

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