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Glucose & Diabetes

Glucose, Random

Normal range < 140 (non-fasting) mg/dL (< 7.8 mmol/L SI). Specimen: Serum or plasma.

Also known as: random blood sugar, RBS, casual glucose.

< 140 (non-fasting) mg/dLCritical: read below

Reference range

This result is reported qualitatively or as a one-sided threshold rather than a two-sided numeric band.

SpecimenSerum or plasma
Conventional range< 140 (non-fasting) mg/dL
SI range< 7.8 mmol/L
Conversion factor×0.0555 (conventional → SI)
Critical value< 50 or > 400 mg/dL
PanelGlucose & Diabetes

Convert any Glucose, Random result between units on the unit converter.

What is the normal range for Glucose, Random?

The standard teaching reference range for Glucose, Random is < 140 (non-fasting) mg/dL in conventional units, or < 7.8 mmol/L in SI units. This value is measured in serum or plasma.

A commonly taught critical (panic) value is < 50 or > 400 mg/dL. Critical results are reported to the provider immediately under your facility's policy.

Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population — always use the range printed on the actual result.

Above the range

Common causes of a high Glucose, Random

  • Diabetes
  • Recent meal
  • Stress hyperglycemia
  • Steroids

Below the range

Common causes of a low Glucose, Random

  • Insulin excess
  • Fasting
  • Alcohol

At the bedside

Nursing considerations

  • A random glucose ≥ 200 mg/dL with symptoms supports diabetes.

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