Reference Values For Hemoglobin A1C (glycated hemoglobin)in Pregnancy

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Reference Values During Pregnancy

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Hemoglobin A_1C, glycated hemoglobin (Whole blood)

Units	Nonpregnant Adult	First Trimester	Second Trimester	Third Trimester
%	4 - 6	4 - 6	4 - 6	4 - 7
Proportion of total hemoglobin	0.04 - 0.06	0.04 - 0.06	0.04 - 0.06	0.04 - 0.07

An A1C greater than or equal to 6.5% (DCCT/UKPDS standardized) identifies women with overt diabetes.

References:

1. Abbassi-Ghanavati M, Greer LG, Cunningham FG. Pregnancy and laboratory studies: a reference table for clinicians. Obstet Gynecol. 2009 Dec;114(6):1326-31. PMID:19935037
2 International Association of Diabetes and Pregnancy Study Groups Consensus Panel.
Diabetes Care. 2010 Mar;33(3):676-82. PMID: 20190296