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Test Code TESTL Testosterone,LAB124

Performing Laboratory

St. Luke's Hospital Laboratory

Specimen Requirements

Preferred Container/Tube:  Gold-top serum tube or red-top serum tube

Acceptable:  EDTA lavender-top and lithium or sodium heparin green-top

Specimen Volume:  0.5 mL of serum or plasma

Minium:  0.25 mL of serum or plasma

 

Stability and Storage:

  • Room temperature:  48 hours
  • Refrigeration (2°- 8°C):  7 days
  • Frozen (≤ -20°C): Undetermined.  Freeze samples only once and mix thoroughly after thawing.

Transport:  Refrigerated

 

Note:  This assay is affected by biotin interference.

Reference Values

Total Testosterone:

 

Male (age) Reference Range (ng/dL)
2-10 <7 - 29
11 <7 - 353
12 <7 - 562
13 8 - 583
14 20 - 777
15 127 - 849
16-20 113 - 882
21-49 123 - 814
≥50 87 - 780

 

 

Females (age) Reference Range (ng/dL)
2-10 <7 - 118
11-15 <7 - 39
16-20 15 - 42
21-59 (Premenopausal) 9 - 48
>60 (Postmenopausal) <7 - 46

 Note: Postmenopausal reference range may be applicable for ages 45-89, correlation with entire patient clinical picture is recommended for appropriate reference range.

 

Pediatric Tanner Stage

Males Reference Range (ng/dL) Females Reference Range (ng/dL)
Stage 1 <7 - 47 Stage 1 <7 - 90
Stage 2 <7 - 174 Stage 2 <7 - 38
Stage 3 10 - 803 Stage 3 <7 - 34
Stage 4 64 - 736 Stage 4 <7 - 39
Stage 5 56 - 897 Stage 5 11 - 50

 

Day(s) Test Set Up

Tuesday and Friday

STAT testing available Monday through Friday, day shift only

Test Classification and CPT Coding

84403

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

Report Available

2-4 days upon receipt