Sign in →

Test ID 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.


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

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

Report Available

8 to 14 days

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

NY State Approved

No