Plasma beta-hydroxybutyrate concentrations after a prolonged fast

Relation between plasma glucose and beta-hydroxybutyrate concentrations in normal subjects and patients with an insulinoma after a prolonged fast. In patients who become hypoglycemic, a plasma beta-hydroxybutyrate concentration below 2.7 mmol/L is suggestive of an insulinoma. To convert plasma glucose values to mmol/L, multiply by 0.056.