Which lab studies are indicated in the workup of adrenal crisis?

Updated: Feb 14, 2018
  • Author: Lisa Kirkland, MD, FACP, FCCM, MSHA; Chief Editor: George T Griffing, MD  more...
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Answer

See the list below:

  • Serum chemistry: Abnormalities are present in as many as 56% of patients. Hyponatremia is common (although not diagnostic); hyperkalemia, metabolic acidosis, and hypoglycemia also may be present. However, the absence of laboratory abnormalities does not exclude the diagnosis of adrenal crisis.

  • Serum cortisol: Less than 20 mcg/dL in severe stress or after ACTH stimulation is indicative of adrenal insufficiency.

  • ACTH test (diagnostic): Determine baseline serum cortisol, then administer ACTH 250 mcg intravenous push (IVP), and then draw serum cortisol 30 and 60 minutes after ACTH administration. An increase of less than 9 mcg/dL is considered diagnostic of adrenal insufficiency.

  • CBC: Anemia (mild and nonspecific), lymphocytosis, and eosinophilia (highly suggestive) may be present.

  • Serum thyroid levels: Assess for autoimmune, infiltrative, or multiple endocrine disorders.

  • Cultures: Perform blood and other cultures as clinically indicated. Infection is a common cause of acute adrenal crisis.


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