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Free androgen index

Alias: FAI

Discipline: Clinical Chemistry

Test information: A free androgen index (FAI) is a test which is ordered to help interpret the results of testosterone tests and allows the active hormone concentration to be measured.
It is calculated using the testosterone result and the result of sex hormone binding globulin (SHBG): FAI = (total testosterone/SHBG) x 100.
FAI is used to investigate hyperandrogenism in females and can help interpret testosterone results in males.

Specimen Type(s)
  • Blood;
Other Acceptable Specimen Type(s)
N/A
Specimen Container - Adult
  • Gold Top SST BD;
Specimen Container - Paediatric
  • Clear - Plain;
Analytes
  • N/A;
Part of a test profile?
Free androgen index
Volume (min) of sample to be sent to laboratory
4ml
Patient Preparation, Sample Handling and Transport
N/A
Maximum add on time
5 days
Units and Reference Ranges / Interpretation
RR for Female
Less than 1 year - 0.0 -1.3%
1yr to less than 9 yrs - 0.0 - 1.3%
9yrs to less than 14 yrs - 0.1 - 2.6%
14yrs to less than 19 yrs - 0.6 -6.5%
19  to less than 50 yrs - 0.7 - 8.7%
50yrs and above - 0.5 - 4.7%
RR for Male
Less than 1 year - 0.0 - 32.7%
1yr to less than 9 yrs - 0.0 - 0.6%
9yrs to less than 14 yrs - 0.2 - 34.7%
14yrs to less than 19 yrs - 3.6 - 83.3%
19  to less than 50 yrs - 24.5 - 113.3%
50yrs and above - 19.3 - 118.4%
UKAS number
8869
UKAS accredited test?
Yes
Comments
N/A

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Last updated: 10-05-2024