Free Androgen Index

Alternative Names/Synonyms	FAI
Laboratory	Core Laboratory & Transfusion Medicine
Sub-section	Biochemistry
Specimen Type	Blood
Test Code	FAI3, FAIP3

Clinical Significance

Estimating the amount of free testosterone in patients with polycystic ovarian syndrome.

The Free Androgen Index is calculcated via:
Total Testosterone/ Sex Hormone Binding Globulin

Specimen Requirements (Sample Type)

Serum, Plasma

Specimen Requirements (Volume (mL))

0.5 mL

Specimen Requirements (Tube Type)

Serum (Gold SST)
Plasma (Light Green PST)
Collection Containers – Tube Types

Collection Requirements

Blood Collection Instructions

Cause for Rejection

Specimen Acceptability and Transport Guidance

Instrument, Methodology

Calculated

Test Availability

24 hours a day, 7 days a week

STAT Turnaround Time

1 hour

Routine Turnaround Time

3 hours

Reference Ranges

Females: 0.02 - 0.12
Males: 0.22 – 0.86

In case of discrepancies, always interpret results using reference ranges as stated on laboratory reports and/or electronic patient chart.

Laboratory Contact Information

416-586-4800 extension 4688