Box 12.1
Oral glucose tolerance testing
Conditions

Performed in the morning after 8–10hr fast

Dose

Glucose 1.75g/kg to a maximum of 75g, drunk within 5–10min

Sampling

Blood glucose at 0 min and at 30min intervals thereafter for 120min

Interpretation

See table below

Blood glucose (mmol/L)
At 0 min At 120 min

Normal

<6.0

<7.8

IGT

6.0–7.0

7.8–11.1

DM

>7.0

>11.1

Blood glucose (mmol/L)
At 0 min At 120 min

Normal

<6.0

<7.8

IGT

6.0–7.0

7.8–11.1

DM

>7.0

>11.1

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