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Test Code TES Testosterone

Specimen Requirements

Specimen Type: Serum
Container/Tube: Gold Top (SSTII) 
Volume: 5.0mL 
Minimum Volume: 0.5mL serum
Collection Instructions: Allow specimen to clot for 30 minutes and centrifuge within 2 hours

Sample Stability

** Preferred temperatures for storage prior to and during shipping to NUH **

 

Specimen Type: Serum
Ambient: 8 hours
Refrigerate: 7 days
Frozen: 6 months 

 

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.

Days and Times Performed

24 hours, TAT 1 day

Methodology

Chemiluminescent Immunoassay

Service Code

31663

Update

Last updated 22/10/2024

Added new comment on reference interval.

Unacceptable Condition

 

Haemolysis NA
Icterus NA
Lipaemic NA
Others NA

 

Testing Laboratory

National University Hospital

Clinical Chemistry, 67724346

Useful For

Diagnosis of hypogonadism in males. Investigation of hirsutism and virilisation in females.