. 2015 Jul;33(3):152–158. doi: 10.2337/diaclin.33.3.152

TABLE 1.

GDM Screening: Diagnostic Plasma Glucose Thresholds of WHO and in Reviewed Country Guidelines (mg/dL) (7–19)

	Diabetes in Pregnancy (US 2014, WHO 2013)	GDM
	Diabetes in Pregnancy (US 2014, WHO 2013)	US 2014			Switzerland 2009	Canada 2013		Australia 2013	UK 2008	France 2011	Germany 2011		Austria 2012	Belgium 2012			WHO 2013
Test specifics	75-g OGTT	IADPSG: (1 step): 75-g OGTT; 1 positive value required	NIH (2 steps): 50-g GCT followed by 100-g OGTT: 2 positive values required		75-g OGTT, 1 positive value required	50-g GCT (2 steps)	75-g OGTT; 1 positive value required (as part of 2-step approach with GCT or as 1 step only, but different threshold)	75-g OGTT; 1 positive value required	Refer to WHO guidelines	75-g OGTT; 1 positive value required	50-g GCT (2 steps)	75-g OGTT; 1 positive value required	75-g OGTT; 1 positive value required	VDV-VVOG 2 step: 50-g GCT followed by 100- or 75-g OGTT		GGOLFB 75-g OGTT; 1 positive value required	75-g OGTT: 1 positive value required
Test specifics	75-g OGTT	IADPSG: (1 step): 75-g OGTT; 1 positive value required	Step 1: 50-g GCT	Step 2: 100-g OGTT^*	75-g OGTT, 1 positive value required	50-g GCT (2 steps)		75-g OGTT; 1 positive value required	Refer to WHO guidelines	75-g OGTT; 1 positive value required	50-g GCT (2 steps)	75-g OGTT; 1 positive value required	75-g OGTT; 1 positive value required	Step 1: 50-g GCT	Step 2: 100- or 75-g OGTT (2 abnormal values required)	GGOLFB 75-g OGTT; 1 positive value required	75-g OGTT: 1 positive value required
Fasting	≥126	≥92	—	≥95^a or ≥105^b	≥92	Non-fasting	2 steps: ≥95; 1 step: ≥92	≥92	—	≥92	—	≥92	≥92		≥95	≥92	92–125: 75-g OGTT
1-hour	—	≥180	≥140	≥180^a or 190^b	≥180	140–198: OGTT; >198: GDM	2 steps: ≥190 1 step: ≥180	≥180	—	—	≥135	≥180	≥180	≥140	≥180	≥180	≥180
2-hour	≥200	≥153	—	≥155^a or ≥165^b	≥153	—	2 steps: ≥162; 1 step: ≥153	≥153	—	≥153	—	≥153	≥153	—	≥155	≥153	153–199
3-hour	—	—	—	≥140^a or ≥145^b	—	—	—	—	—	—	—	—	—	—	≥140	—	—
Random	≥200	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—

GCT, glucose challenge test; GGOLFB, Groupement des Gynécologues Obstétricien de Langue Française de Belgique; IADPSG, International Association of Diabetes and Pregnancy Study Groups; NIH, National Institutes of Health; OGTT, oral glucose tolerance test; UK, United Kingdom; US, United States; VDV, Vlaamse Diabetes Vereniging; VVOG, Vlaamse Vereniging voor Obstetrie en Gynecologie.

This guideline includes two differing sets of diagnostic glucose thresholds, referred to as ^aCarpenter/Coustan and ^bNational Diabetes Data Group.