What are the normal glucose reference ranges, and what are the possible critical values?

Updated: Jul 22, 2021
  • Author: Setu K Patolia, MD, MPH; Chief Editor: Sridevi Devaraj, PhD, DABCC, FAACC, FRSC, CCRP  more...
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Answer

Answer

The normal glucose reference ranges are as below [1] :

  • Cord - 45-96 mg/dL or 2.5-5.3 mmol/L (SI units)
  • Premature infant - 20-60 mg/dL or 1.1-3.3 mmol/L
  • Neonate - 30-60 mg/dL or 1.7-3.3 mmol/L
  • Infant - 40-90 mg/dL or 2.2-5.0 mmol/L
  • Child <2 years - 60-100 mg/dL or 3.3-5.5 mmol/L
  • Adult - 74-106 mg/dL or 4.1-5.9 mmol/L

For children over age 2 years to adult, the normal reference ranges are as follows [1] :

  • Fasting (ie, no caloric intake for at least 8 hours) - 70-100 mg/dL or <5.5 mmol/L
  • Casual or random (ie, any time of day, with no regard to food intake) - ≤200 mg/dL (<11.1 mmol/L)

For elderly patients, the normal reference ranges are as follows [1] :

  • 60-90 years - 82-115 mg/dL or 4.6-6.4 mmol/L
  • >90 years - 75-121 mg/dL or 4.2-6.7 mmol/L

Possible critical values

These are as follows [1] :

  • Adult male - 400 mg/dL
  • Adult female - 400 mg/dL
  • Infant - <40 mg/dL
  • Newborn - 300 mg/dL

Two-hour postprandial glucose

Normal values are as follows [1] :

  • 0-50 years - <140 mg/dL or <7.8 mmol/L (SI units)
  • 50-60 years - <150 mg/dL
  • 60 years and older - <160 mg/dL

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