Sign in →

Test Code FFTFD Testosterone, Free, Mass Spectrometry/Equilibrium Dialysis (Endocrine Sciences)


Specimen Required


Collection Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Submission Container/Tube: Plastic vial

Specimen Volume: 2 mL

Collection Instructions:

1. Draw blood in a plain red-top tube(s), serum gel tube(s) is acceptable.

2. Within  45 minutes of draw, centrifuge and aliquot 2 mL of serum into a plastic vial.

3. Send frozen.

Note: To avoid delay in turnaround time when requesting multiple tests, submit separate frozen specimens for each test requested.


Secondary ID

75895

Method Name

Testosterone: high-pressure liquid chromatography (HPLC)/tandem mass spectrometry

Free testosterone: equilibrium dialysis

Reporting Name

Testosterone, Free MS/Dialysis

Specimen Type

Serum

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Frozen (preferred)
  Refrigerated  7 days
  Ambient  6 days

Reject Due To

Gross hemolysis Reject

Reference Values

Testosterone Expected Values:

Males:

Age:

Range (ng/dL):

Premature (26-28 weeks) Day 4

59-125

Premature (31-35 weeks) Day 4

37-198

Newborns (1 to 7 months)

75-400

Prepubertal (1 to 10 years)

<2.5-10

Adults (>18)

264-916

 

Females:

Age:

Range (ng/dL):

Premature (26-28 weeks) Day 4

5-16

Premature (31-35 weeks) Day 4

5-22

Newborns (1 to 7 months)

20-64

Prepubertal (1 to 9 years)

<2.5-10

Premenopausal

10-55

Postmenopausal

7-40

 

Males:

Tanner Stage:

Age (years):

Testosterone (ng/dL):

I

<9.8

<2.5-10

II

9.8-14.5

18-150

III

10.7-15.4

100-320

IV

11.8-16.2

200-620

V

12.8-17.3

350-970

 

Females:

Tanner Stage:

Age (years):

Testosterone (ng/dL):

I

<9.2

<2.5-10

II

9.2-13.7

7-28

III

10.0-14.4

15-35

IV

10.7-15.6

13-32

V

11.8-18.6

20-38

 

Free Testosterone Expected Values:

Males:

Age:

% Free:

pg/mL

Full-term infants (1-15 days)

0.9-1.7

1.5-31

Full-term infants (1-2 months)

0.4-0.8

3.3-18

Full-term infants (3-4 months)

0.4-1.1

0.7-14

Full-term infants (5-6 months)

0.4-1.0

0.4-4.8

Prepubertal children (1-10 years)

0.4-0.9

0.15-0.6

Puberty

*

*

Adults

1.5-3.2

52-280

 

Females:

Age:

% Free:

pg/mL

Full-term infants (1-15 days)

0.8-1.5

0.5-2.5

Full-term infants (1-2 months)

0.4-1.1

0.1-1.3

Full-term infants (3-4 months)

0.5-1.0

0.3-1.1

Full-term infants (5-6 months)

0.5-0.8

0.2-0.6

Prepubertal children (1-10 years)

0.4-0.9

0.15-0.6

Puberty:

*

*

Adults

0.8-1.4

1.1-6.3

 

*Puberty: Comprehensive values for free testosterone by dialysis for both males and females throughout puberty are currently unavailable.

Day(s) Performed

Varies

Performing Laboratory

Esoterix Endocrinology

CPT Code Information

84402

84403

LOINC Code Information

Test ID Test Order Name Order LOINC Value
FFTFD Testosterone, Free MS/Dialysis Not Provided

 

Result ID Test Result Name Result LOINC Value
Z6361 Testosterone, Total 2986-8
Z6362 % Free Testosterone, (Dialysis) 15432-8
Z6363 Free Testosterone, Serum 2991-8