Fasting: <126 mg/dL; SI units: <7 mmol/L
2-hr: <200 mg/dL; SI units <1.1 mmol/L
. Red-top tube. Fasting sample.
■ Blood glucose levels are assessed twice. The first is a fasting
sample, the second sample is taken 2 hr after ingestion of
75 g of glucose. Samples may be assessed at other times as well.
■ Useful for screening for gestational diabetes but usually
unnecessary for diagnosing diabetes as fasting blood glucose
>126 mg/dL or a random blood glucose level >200 mg/dL is
ususally considered diagnostic.
