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Test Code FTES Testosterone, free

Important Note

This test should not be performed on patients who received radioactive material in the last 7 days. 

Laboratory Code

LAB839

Specimen Requirements

Specimen Type: Serum

Container/Tube: Gold Top (SSTII) / Red Top

Volume: 5.0 mL / 6.0 mL blood
Minimum volume: 0.5 mL serum

Collection Instructions: Allow specimen to clot for 30 mins and centrifuge within 2 hrs

Specimen Stability

Specimen Type Serum
Ambient 8 hours
Refrigerate 1 day
Frozen 2 months (preferred)

Methodology

Radioimmunoassay

Days and Times Performed

Alternate Friday, TAT 2 - 15 days

Specimen Condition

Haemolysis OK
Icterus OK
Lipaemia OK
Others Not applicable

Reference Interval

Age Group Male (pmol/L) Females (pmol/L)
< 15 yrs ≤ 6.25 ≤ 9.38
15 – 39 yrs 18.75 – 138.89 ≤ 15.97
40 – 59 yrs 12.50 – 89.24 ≤ 13.89
≥ 60 yrs 5.21 – 100.00 ≤ 17.36

Testing Laboratory

National University Hospital
Clinical Chemistry, 67724399

Useful For

For In Vitro determination of Free Testosterone levels in hirsutism and hypogonadism

Service Code

31672

LOINC Code Information

25987-9

Update

Last updated 24/02/2025