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Testosterone, Free, Direct

Important Note

LabCorp Test 144980

Testosterone, Free, Direct

 

Icon Photo

Gold Top (SST-Gel)

Useful For

Evaluate hirsutism and masculinization in women; evaluate testicular function in clinical states where the testosterone binding proteins may be altered (obesity, cirrhosis, thyroid disorders)

Special Instructions

State patient's age and sex on the test request form.

Specimen Requirements

Preferred:
Container/Tube:  Gold Top (SST-Gel) or Red-top tube
Minimum Volume: 0.5 mL Blood
Collection Instructions: None

Storage Instructions: Room Temperature

Specimen Stability

Ambient: 14 days
Refrigerate: 14 days
Frozen: 14 days

Reject Due To

Gross lipemia; gross hemolysis; gross icterus

Turn Around Time

4-6 days

Reference Range

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

Methodology

 

Direct analog enzyme immunoassay (EIA)

CPT

84402