Ordering Recommendation

Provides a calculated value for bioavailable testosterone concentration using total testosterone measured by immunoassay. Use to evaluate hypogonadism in cisgender males with a total testosterone concentration at the lower limit of normal. May be used to evaluate testosterone status in individuals with protein-binding abnormalities or to monitor testosterone hormone therapies. Not recommended when low testosterone concentrations, such as those found in children and cisgender females, are expected. For these individuals, testing by mass spectrometry is recommended; refer to Testosterone, Bioavailable and Total, Includes Sex Hormone-Binding Globulin (Adult Females, Children, or Individuals on Testosterone-Suppressing Hormone Therapy) (0081057).

Mnemonic

BIO T

Methodology

Quantitative Electrochemiluminescent Immunoassay
The concentrations of free and bioavailable testosterone are derived from mathematical expressions based on constants for the binding of testosterone to albumin and/or sex hormone binding globulin.

Performed

Sun-Sat

Reported

Within 24 hours

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation

Collect specimen between 6-10 a.m.

Collect

Serum separator tube or green (lithium heparin).

Specimen Preparation

Transfer 2 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.6 mL)

Storage/Transport Temperature

Refrigerated.

Unacceptable Conditions

EDTA plasma.

Remarks
Stability

After separation from cells: Ambient: 48 hours; Refrigerated: 1 week; Frozen: 2 months

Reference Interval

Test Number
Components
Reference Interval
0070111 Testosterone, Free (Adult Males or Individuals on Testosterone Hormone Therapy) Male:
14-15 years:  3-138 pg/mL
16-17 years:  38-173 pg/mL
18 years and older: 47-244 pg/mL

Tanner Stage IV:  35-169 pg/mL
Tanner Stage V:  41-239 pg/mL
0070130 Testosterone (Adult Males or Individuals on Testosterone Hormone Therapy) Male:
14-15 years: 33-585 ng/dL
16-17 years: 185-886 ng/dL
18-39 years: 300-1080 ng/dL
40-59 years: 300-890 ng/dL
60 years and older: 300-720 ng/dL

Tanner Stage IV: 165-854 ng/dL
Tanner Stage V: 194-783 ng/dL
0099375 Sex Hormone Binding Globulin
Age Male Female
1-30 days
31-364 days
1-3 years
4-6 years
7-9 years
10-12 years
13-15 years
16-17 years
18-49 years
50 years and older
13-85 nmol/L
70-250 nmol/L
50-180 nmol/L
45-175 nmol/L
28-190 nmol/L
23-160 nmol/L
13-140 nmol/L
10-60 nmol/L
17-56 nmol/L
19-76 nmol/L
14-60 nmol/L
60-215 nmol/L
60-190 nmol/L
55-170 nmol/L
35-170 nmol/L
17-155 nmol/L
11-120 nmol/L
19-145 nmol/L
25-122 nmol/L
17-125 nmol/L
Tanner Stage I
Tanner Stage II
Tanner Stage III
Tanner Stage IV
Tanner Stage V
26-186 nmol/L
22-169 nmol/L
13-104 nmol/L
11-60 nmol/L
11-71 nmol/L
30-173 nmol/L
16-127 nmol/L
12-98 nmol/L
14-151 nmol/L
23-165 nmol/L

Component
Reference Interval
Testosterone, Bioavailable, Adult Male 14-15 years:  10-337 ng/dL
16-17 years: 35-509 ng/dL
18 years and older: 131-682 ng/dL

Tanner Stage IV:  40-485 ng/dL
Tanner Stage V:  124-596 ng/dL
Testosterone, Percentage Free, Adult Male 1.6-2.9%

Interpretive Data

Bioavailable testosterone concentration is calculated using total testosterone (measured by immunoassay) and the binding constant of testosterone and sex hormone-binding globulin (SHBG) and/or albumin. Testosterone immunoassays are both imprecise and inaccurate at low testosterone concentrations, such as those found in children and cisgender females. For these individuals, testing by mass spectrometry is recommended; refer to Testosterone, Bioavailable and Total, Includes Sex Hormone-Binding Globulin (Adult Females, Children, or Individuals on Testosterone-Suppressing Hormone Therapy) (ARUP test code 0081057).

For individuals on testosterone hormone therapy, refer to cisgender male reference intervals. No reference intervals have been established for males younger than 14 years or for cisgender females. For a complete set of all established reference intervals, refer to ltd.aruplab.com/Tests/Pub/0070102.

Compliance Category

FDA

Note

Bioavailable testosterone includes free plus weakly bound (non-SHBG bound) testosterone.  Bioavailable testosterone is an assessment of the biologically active testosterone in serum.

Hotline History

N/A

CPT Codes

84402; 84403; 84270

Components

Component Test Code* Component Chart Name LOINC
0070113 Testosterone, Free Calculation 2991-8
0070114 Testosterone, Percentage Free 15432-8
0070130 Testosterone by Immunoassay 2986-8
0070134 Testosterone, Bioavailable 2990-0
0099375 Sex Hormone Binding Globulin 13967-5
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • TeBG
  • Testosterone-estrogen Binding Globulin
Testosterone, Bioavailable and Total, Includes Sex Hormone-Binding Globulin (Adult Males or Individuals on Testosterone Hormone Therapy)