Pathology Handbook

Glucose

Synonyms

Blood sugar

Clinical Indications

For the investigation of diabetes or hypoglycaemia

Request Form 

Request on ICE

Availability

On request.

Specific Criteria

None

Patient Preparation

Ideally, test should be done when patient is fasting (overnight for 10 hours)

Turnaround Time

Same day
Available urgently

Specimen

Plasma; grey vacutainer

Volume

2 mL

Container

Vacutainer grey top

Collection

Samples should be transported to laboratory within 4 hours

Causes for Rejection

Unlabelled sample
Not meeting specific criteria for analysis. 

Reference Range

Random glucose: 3.5 - 11.0 mmol/L

Fasting glucose: 3.5 - 6.0 mmol/L

A fasting glucose of >7.0 mmol/L on two occasions is diagnostic of diabetes

A random glucose of >11.0 mmol/L on two occasions is diagnostic of diabetes