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Test Code TESTL Testosterone II,LAB124 (Total Testosterone)

Performing Laboratory

St. Luke's Hospital Laboratory

Specimen Requirements

Preferred Container/Tube:  Green top (Lithium Heparin)

Acceptable:  EDTA plasma, Gold top-SST, or Red Top

Specimen Volume:  0.5 mL 

Minimum Volume:  0.012 mL plus dead volume

Stability and Storage:

  • Room temperature:  5 days
  • Refrigeration (2°- 8°C): 14 days
  • Frozen (≤ -20°C): 6 months.  Freeze samples only once and mix thoroughly after thawing.

Transport:  Refrigerated

 

Reference Values

 

Male ng/dL

Female ng/dL

Newborn

75 – 400

20 – 64

1-7 months

<400

<64

7 months – 9 years

<10

<15

Tanner Stage I

<20

<17

Tanner Stage II

<149

<39

Tanner Stage III

<762

<60

Tanner Stage IV

164 – 854

<63

Tanner V

194 – 783

<60

≥18 years

 

<75

18 – 39 years

300 – 1080

 

40 – 59 years

300 – 890

 

≥60 years

300 – 720

 

 

 

 

 

 

Day(s) Test Set Up

Monday-Sunday

 

Useful For

Clinical evaluation of serum total testosterone, along with serum LH, assists in evaluation of hypogonadal males. Major causes of lowered testosterone in males include hypogonadotropic hypogonadism, testicular failure, hyperprolactinemia, hypopituitarism, some types of liver and kidney diseases, and critical illness.

Methodology

Chemiluminescence Assay

Test Classification and CPT Coding

84403

Report Available

Stat within 1 hr of receipt

Routine within 2 hrs of receipt