When is insulin testing indicated?

Updated: Jan 02, 2019
  • Author: Saranya Buppajarntham, MD; Chief Editor: Eric B Staros, MD  more...
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Insulin testing is used to assist in identifying causes of hypoglycemia (plasma glucose levels < 55 mg/dL), especially upon signs and symptoms of hypoglycemia (neurohypoglycopenic and autonomic symptoms). In this scenario, a 72-hour fasting test is performed. [2]

Insulin levels can also be used to assess insulin resistance/sensitivity. In addition, insulin testing is used to help differentiate type 1 from type 2 diabetes.

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