What are the reference ranges of insulin levels?

Updated: Jan 02, 2019
  • Author: Saranya Buppajarntham, MD; Chief Editor: Eric B Staros, MD  more...
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Insulin is an anabolic hormone that promotes glucose uptake, glycogenesis, lipogenesis, and protein synthesis of skeletal muscle and fat tissue through the tyrosine kinase receptor pathway. In addition, insulin is the most important factor in the regulation of plasma glucose homeostasis, as it counteracts glucagon and other catabolic hormones—epinephrine, glucocorticoid, and growth hormone.

Table 1. Reference Range of Insulin Levels [1] (Open Table in a new window)


Insulin Level

Insulin Level (SI Units*)


< 25 mIU/L

< 174 pmol/L

30 minutes after glucose administration

30-230 mIU/L

208-1597 pmol/L

1 hour after glucose administration

18-276 mIU/L

125-1917 pmol/L

2 hour after glucose administration

16-166 mIU/L

111-1153 pmol/L

≥3 hours after glucose administration

< 25 mIU/L

< 174 pmol/L

*SI unit: conversional units x 6.945

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