21-Hydroxylase Antibodies

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CPT Code:


Test Type: 0.5 mL Serum
Stability Time:



Room temperature

14 days


14 days


2 years

Freeze/thaw cycles

Stable x6


Addison's disease (chronic primary adrenal insufficiency) is commonly caused by autoimmune destruction of the adrenal cortex and is characterized by the presence of adrenal cortex autoantibodies in the serum. It can occur sporadically or in combination with other autoimmune endocrine diseases that together comprise Type I or Type II autoimmune polyglandular syndrome. The microsomal autoantigen, steroid 21-hydroxylase enzyme, has been shown to be the primary autoantigen associated with autoimmune Addison's disease. Measurement of 21-hydroxylase autoantibodies aids in diagnosis and management of patients with adrenal insufficiency.

Collection Details:

Collection Instructions:

Red-top tube or gel tube.

Separate serum from cells within one hour. Transfer to a plastic transport tube before freezing. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Frozen or cold pack.