Addison’s disease, also known as Adrenal Insufficiency or Hypocortisolism, is an endocrine disease that occurs when the adrenal glands do not produce enough of the hormone cortisol and sometimes, aldosterone. Discuss topics including symptoms and treatments for Addison’s disease.
This is a thyroid test that reportedly many fibromyalgia and CFS patients are failing. This test is also known as R-T3. Many Endocrinologists don't seem to be aware of this test.... but this is something that may be of interest to you if you have thyroid symptoms and/or thyroid problems.
http://www.holtorfmed.com/nss-folder/printable_pdf/thyroid/reverse_r3_%20thebest.pdf --- "Reverse T3 is the Best Measurement of Tissue Thyroid Levels"
http://thyroid.about.com/library/glossary/bl-reverset3.htm --- Reverse T3