Random Glucose

The normal reference range for Random Glucose is A random (non-fasting) glucose below 7.8 mmol/L is generally normal. A random reading of 11.1 mmol/L or higher, especially with symptoms, suggests diabetes and should be confirmed with a fasting glucose or HbA1c. Note: a fasting sample has a tighter normal range of 3.0-5.5 mmol/L.. Reference ranges may vary between laboratories, so always consult your healthcare provider for interpretation.

Helps assess your current glucose regulation and screen for potential metabolic issues that could affect heart health and diabetes risk.

A high random glucose most often reflects diabetes or pre-diabetes, but because it is non-fasting it is also raised simply by a recent carbohydrate-rich meal or sugary drink. Other causes include physical or emotional stress, acute illness or infection, corticosteroid medication, pancreatitis, Cushing's syndrome and an overactive thyroid. A high random result is a screening flag, not a diagnosis — it is confirmed with a fasting glucose, HbA1c or oral glucose tolerance test.

Low blood glucose (hypoglycaemia, generally below 4.0 mmol/L) is most commonly caused by diabetes treatment — too much insulin or sulfonylurea relative to food. Non-diabetic causes include prolonged fasting, heavy alcohol use, severe liver disease, adrenal insufficiency (Addison's disease), and rarely an insulin-secreting tumour. Symptoms include shakiness, sweating, hunger, confusion and, if severe, loss of consciousness.

Random glucose is often measured opportunistically in general blood panels. For diabetes screening, a fasting glucose or HbA1c is preferred. Adults with risk factors (overweight, family history, gestational diabetes history, or Aboriginal and Torres Strait Islander background) should be screened every 1-3 years, and pregnant women are screened for gestational diabetes around 24-28 weeks.