Table. Screening steps and cutoff values of the two-step test for GDM.

	Testing		Cutoff value		Consequence
	Dose	Timing of test	mmol/L	mg/dL
Pre-test (GCT)
	50 g	after 1 hour	≥ 7.5 and ≤ 11.1*	≥ 135 and ≤ 200*	prompt application of the diagnostic test
Diagnostic test (oGTT)
		directly fasting	≥ 5.1	≥ 92	upon reaching or exceeding one of the 3 cutoff values: GDM diagnosis
	75 g	after 1 hour	≥ 10.0	≥ 180
		after 2 hours	≥ 8.5	≥ 153

GCT, glucose challenge test; GDM, gestational diabetes mellitus; oGTT, oral glucose tolerance test

*If these cutoffs are exceeded, manifest diabetes must be ruled out or confirmed