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Test Code TES Testosterone, Total Only, Serum

Important Note

Many dietary supplements promoted for hair, skin, and nail benefits contain Biotin (Vitamin B7) levels up to 650 times the recommended daily intake.  High levels of Biotin can cause clinically significant incorrect lab test results, resulting in falsely high or falsely low results, depending on the test. Patients taking high doses of Biotin should be instructed to discontinue Biotin for at least 12 hours prior to lab testing.

Performing Laboratory

MaineGeneral Medical Center

Specimen Requirements

Serum
Draw blood in a gold-top (serum separator) gel tube or a red-top (no additive) tube. Label the specimen with the patient’s name (first and last), date of birth, date and time of draw, the phlebotomist’s initials and as serum. Spin down and send 1 mL of serum refrigerated.

 

Specimen stability:   
48 hours at room temperature
7 days refrigerated at 2-8°C
If testing can not be completed in 7 days, freeze at ≤ -20°C for longer storage

 

Minimum volume:    
1 mL

 

Specimen rejection criteria:

Specimens stored at room temperature >48 hours will be rejected. 
 

Day(s) Test Performed

Tuesday and Friday

Test Classification and CPT Coding

84403

Methodology

Immunochemiluminometric Assay (ICMA)

Useful in evaluation of hirsutism and masculinization in women; evaluation of testicular function in clinical states where the testosterone binding proteins may be altered.

Reference Values

Males:

>50 yrs            87-780 ng/dL

21-49 yrs         123-814 ng/dL

16-20 yrs         113-882 ng/dL

15-15.9 yrs      127-849 ng/dL

14-14.9 yrs       20-777 ng/dL

13-13.9 yrs       8-583  ng/dL

12-12.9 yrs       0-562 ng/dL

11-11.9 yrs        0-353 ng/dL

2-10.9 yrs          0-29 ng/dL

 

Females (Adult):

0-47 ng/dL