Testosterone, Free and Total


Abbrev Code:BTEST   
Order Code:LAB6538Order Name:Testosterone, Free
Synonyms:Free Testosterone: SHBG; BTEST
Methodology:Calculation, Vermeulen
CPT Codes: 84403 x1, 84270 x1
Test Includes:Total testosterone (TEST) and sex hormone binding globulin (SHBGT)
Turnaround Time:Performed Mon-Fri; results are reported within 2-3 days.
Compliance:

Analyte Specific Reagents are used in many laboratory tests necessary for standard medical care and generally do not require U.S. Food and Drug Administration (FDA) approval. This test was developed and its performance characteristics determined by Fairview Laboratory Services. It has not been cleared or approved by the U.S. Food and Drug Administration. This test is used for clinical purposes. It should not be regarded as investigational or for research.


Collection Instructions

Specimen:Blood
Optimal Volume:4 mL
Minimum\Peds Volume:1.8 mL
Container:Red (no gel)
Collection Instructions:Red (gel) containers are also acceptable. Gold gel containers are not acceptable due to a clot activator that interferes with this assay.
Causes for Rejection:Hemolyzed specimen. Collection in gold gel container. Sample not separated from cells within 2 hours of collection.


Processing and Shipping

Specimen Processing:Within 2 hours, centrifuge and aliquot 1 mL, 0.4 mL minimum for sex hormone binding globulin and 1 mL, 0.4 mL for total testosterone. Two aliquots are required. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab UM Specialty Core/Prot/Endo (Architect A) 


Interpretive

Reference Range:
Free Testosterone Female (ng/dL)
1-6 y Less than 0.06
7-9 y 0.06 - 0.18
10-11 y 0.01 - 0.35
12-13 y 0.09 - 0.68
14-15 y 0.12 - 0.75
16-17y 0.12 - 0.99
18-30 y 0.09 - 0.74
31-40 y 0.13 - 0.92
41-51 y 0.11 - 0.58
Postmenopausal 0.06 - 0.38
 
 
Free Testosterone Male (ng/dL)
1-6 y Less than 0.06
7-9 y 0.01 - 0.09
10-11 y 0.01 - 0.63
12-13 y 0.05 - 9.8
14-15 y 0.30 - 13.8
16-17 y 3.8 - 17.3
Greater than 17 y 4.7 - 24.4
 
 
Tanner Ranges Female ng/dL Male ng/dL
Tanner Stage I Less than 0.22 Less than or equal to 0.37
Tanner Stage II 0.04 - 0.45 0.03 - 2.1
Tanner Stage III 0.13 - 0.75 0.10 - 9.8
Tanner Stave IV 0.11 - 1.55 3.5 - 16.9
Tanner Stage V 0.08 - 0.92 4.1 - 23.9
           
Use:Evaluation of men with signs of hypogonadism, boys with delayed or precocious puberty, women with hirsutism, virilization, and oligo-amenorrhea, or infants with ambiguous genitalia or virilization; monitoring testosterone replacement or antiandrogen therapy.


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