What are the reference ranges of glucose by assay type?

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

  • Plasma and serum - Refer to the values advised by the American Diabetes Association, as specified at the beginning of this article
  • Urine - The reference range is 1-15 mg/dL, and the 24-hour range is below 0.5 g/day [5]
  • CSF - The adult reference range is 40-70 mg/dL, although most clinicians accept that it should be over two thirds of the serum glucose level [5]  

Values are sometimes expressed as mmol/L. To convert mg/dL to mmol/L, multiply mg/dL by 0.0555; for reverse conversion, multiply mmol/L by 18. [5]  To convert results from grams/day to mmol/day, multiply grams/day by 5.55.

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