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Testosterone, Free and Total

Message
Aids in the evaluation of suspected hypogonadism in men with a total testosterone level at the lower limit of the normal range and the detection of hyperandrogenemia in women.


Test Code
LAB173


Alias/See Also
Free and Total Testosterone, for
Adult Males and Females


Includes
Albumin
Sex Hormone Binding Globulin
Testosterone Total
Testosterone Free


Minimum Volume
Albumin = 0.2 mL plasma
Testosterone, SHBG = 0.5 mL serum


Instructions
Routine venipuncture.
Collect two 5 mL Red/Gold top serum separator tubes.


Specimen Stability
Albumin = Refrigerate, stable 48 hours;   stable 8 hours at room temperature;  stable >48 hours frozen
SHBG = Refigerate, stable 7 days


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
insufficient quantity;  hemolysis or lipemia;  failure to follow stability requirements


Methodology
Albumin = Dye binding - BCG
Testosterone Total = Electrochemiluminescence immunoassay
SHBG = Electrochemiluminescence immunoassay
Testosterone free = calculated

Setup Schedule
Tuesday, Friday - PM Shift


Report Available
Within 24 hours of setup run


Limitations
TSTFC = Testosterone, Free cannot be ordered on a pediatric
patient less than 18 years old. 


Reference Range
Albumin 3.5 - 5.0 g/dL

SHBG
Female 18-144 nmol/L
Male     10-57 nmol/L

Testosterone Total
Females:
Ovulating:       0-73 ng/dL
Post Menopausal: 0-43 ng/dL
Males:
20-49 years: 72-853 ng/dL
>50 years:  129-767 ng/dL

Testosterone Free
Female => 18 years old 0.328 - 2.250 %
Male => 18 years old 1.470 - 3.210 %






The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.