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Free Androgen Index

Source Blood
Mnemonic FAI
Specimen Requirements

1 x 3.5 mL gold top SST tube
AND
1 x 3 mL or 4.5 mL light green (mint) top PST tube. Gold top SST tube also acceptable.

1.5 mL serum/plasma

Pediatric: 0.5 mL whole blood

Specimen Handling  
Additional Information Free Androgen Index is a calculation using the SHBG & Testosterone results.
Testing Location Immunochemistry
Testing Frequency Weekdays
Alternate Name(s) FAI
Reference Interval

Male

>29.9

Female

<5.1