Days Set Up
Daily, 24 hours
Analytic Time

4 hours

MiChart Code
Soft Order Code

Test Updated:



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Test Overview

Test Methodology

Chemiluminescent Immunoassay (CLIA)

Test Usage

A reliable indicator of LH secretion and Leydig cell function. Evaluation of gonadal and adrenal function. Helpful in the diagnosis of hypogonadism in males and hirsutism and virilization in females.

Reference Range

Male 1-10 yrs: 0.00-0.20 ng/mL; Male 10-14 yrs: 0.10-5.00 ng/mL; Male 14-18 yrs: 1.00-9.50 ng/mL; Adult Male: 2.50 - 9.50 ng/mL; Female 1-10 yrs: 0.00-0.20 ng/mL; Female 10-14 yrs: 0.10-0.50 ng/mL; Adult Female: 0.10 to 0.90 ng/mL. Note that there can be significant diurnal variation in testosterone levels in both males and females. Reference ranges are based on morning samples. Caution should be taken in interpreting values drawn at other times of the day.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect specimen in an SST (preferred) or red top tube. Centrifuge, aliquot serum into a plastic vial and refrigerate up to 48 hours or freeze for longer storage.

Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.25 mL serum

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.