Quick Facts
- Sample: Blood
- Fasting: No special preparation required
- Turnaround: 7-11 days (may take longer based on weather, holiday, or lab delays)
What This Test Measures
This test measures 21-hydroxylase antibodies, which are autoantibodies your immune system may produce against the adrenal enzyme 21-hydroxylase. This is not a measurement of a hormone itself. It detects an immune marker associated with autoimmune attack on the adrenal glands.
The presence of these antibodies is consistent with developing or established autoimmune adrenal insufficiency, also known as Addison's disease. This test does not measure cortisol, aldosterone, or any other adrenal hormone directly. It reflects autoimmune activity that may affect the adrenal glands' ability to produce these hormones over time.
Benefits
- Detects autoantibodies linked to autoimmune adrenal insufficiency
- Helps assess risk of developing Addison's disease
- Supports evaluation alongside other autoimmune condition assessments
- Requires no special preparation before testing
- Uses a simple blood sample
Who Is This Test For?
- Individuals with symptoms suggestive of adrenal insufficiency
- People with a personal history of autoimmune conditions
- Those with a family history of Addison's disease
- Individuals being evaluated for unexplained fatigue or low blood pressure
- People with other autoimmune diagnoses, such as thyroid disorders or type 1 diabetes
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this test?
This test identifies 21-hydroxylase antibodies, autoantibodies your immune system may produce against the adrenal enzyme 21-hydroxylase, rather than measuring a hormone directly. It helps a healthcare provider evaluate your risk of autoimmune adrenal insufficiency, also called Addison's disease, by detecting an immune marker associated with autoimmune attack on the adrenal glands. This test alone does not diagnose the condition.
2. Who should consider this test, and when should I order it?
This test may be appropriate if you have symptoms suggestive of adrenal insufficiency, such as unexplained fatigue or low blood pressure, or if you have a personal or family history of autoimmune conditions, including Addison's disease. It may also be useful if you have an existing autoimmune diagnosis, such as thyroid disease or type 1 diabetes, as part of a broader assessment. This test does not replace a full medical evaluation and is one piece of information your provider may use; your healthcare provider can help determine if it's appropriate for your situation.
3. How does this test differ from other hormone tests?
Unlike tests that measure cortisol, aldosterone, or other adrenal hormones directly, this test detects an autoantibody, an immune marker that reflects activity which may affect future adrenal hormone production rather than current hormone status.
4. Do I need to fast before this test?
No special preparation is required for this test.
5. How quickly will I get results?
Results are typically available in 7-11 days. This may take longer depending on weather, holidays, or lab delays.
6. How do I interpret the results?
The meaning of this result depends on your symptoms, medical history, and other laboratory findings. Because this test measures an autoantibody rather than a hormone, results are often interpreted alongside adrenal hormone testing and clinical evaluation when appropriate. A positive result does not confirm a diagnosis of Addison's disease on its own, and a negative result does not rule out adrenal insufficiency from other causes. Discuss your results with a qualified healthcare provider for full interpretation.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
7. What should I do if my results are abnormal?
Review abnormal results with a qualified healthcare provider, who may consider additional evaluation or testing based on your overall health and symptoms.
8. How often should I get tested?
Testing frequency should be determined as directed by your healthcare provider, based on your individual health history and clinical needs.
Pre test preparation
No special preparation is required for this test.
