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HelpTest Code TES Testosterone
Laboratory Code
LAB124
Specimen Requirements
Specimen Type: Serum
Container/Tube: Gold Top (SSTII)
Volume: 5.0 mL
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 | 7 days |
| Frozen | 6 months |
Methodology
Chemiluminescent Immunoassay
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Gross Lipaemia | Alert/Reject |
| Others | Not applicable |
Reference Interval
| Age | Male |
|---|---|
| 4 days – 5 mths | 0.3 – 10.4 nmol/L |
| 6 mths – 8 yrs | ≤ 1.2 nmol/L |
| 9 – 10 yrs | ≤ 0.8 nmol/L |
| 11 – 13 yrs | ≤ 15.4 nmol/L |
| 14 – 15 yrs | 1.3 – 21.9 nmol/L |
| 16 – 18 yrs | 5.1 – 27.6 nmol/L |
| 19 – 49 yrs | 8.3 – 30.2 nmol/L |
| ≥ 50 yrs | 7.7 – 24.8 nmol/L |
| Age | Female |
|---|---|
| 4 days – 8 yrs | ≤ 2.2 nmol/L |
| 9 – 12 yrs | ≤ 1.0 nmol/L |
| 13 – 14 yrs | 0.4 – 1.5 nmol/L |
| 15 – 18 yrs | 0.5 – 1.7 nmol/L |
| 19 – 49 yrs | 0.5 – 1.9 nmol/L |
| ≥ 50 yrs | 0.4 – 1.2 nmol/L |
Male
Tanner Stage I: ≤ 1.0 nmol/L
Tanner Stage II: 0.1 – 9.7 nmol/L
Tanner Stage III: 0.3 – 22.7 nmol/L
Tanner Stage IV: 0.7 – 26.2 nmol/L
Tanner Stage V: 0.6 – 31.3 nmol/L
Female
Tanner Stage I: ≤ 1.1 nmol/L
Tanner Stage II: 0.7 nmol/L
Tanner Stage III: 0.3 – 1.4 nmol/L
Tanner Stage IV: 0.5 – 1.9 nmol/L
Tanner Stage V: 0.6 – 3.4 nmol/L
Note:
Nandrolone may lead to elevated testosterone levels by > 300% when
tested at 30 nmol/L concentration, according to manufacturer’s guide.
17-ketotestosterone may lead to reduced testosterone by < 10% when
tested at 5 nmol/L concentration, according to manufacturer’s guide.
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Diagnosis of hypogonadism in males.
Investigation of hirsutism and virilisation in females.
Service Code
31663
LOINC Code Information
83115-6
Update
Last updated 13/03/2025