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HelpTest Code TES Testosterone
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 |
Specimen Condition
| Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Gross Lipaemia | Alert/Reject |
| Others | Not applicable |
Methodology
Chemiluminescent Immunoassay
Days and Times Performed
24 hrs, TAT 1 day
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.
Update
Last updated 13/03/2025
LOINC Code Information
83115-6
Service Code
31663
Laboratory Code
LAB124