Optimal first trimester HbA1c threshold to identify Singaporean women at risk of gestational diabetes mellitus and adverse pregnancy outcomes: A pilot study. (June 2019)

• Record Type: Journal Article
• Authors: Poo, Zi X; Wright, Ann; Ruochen, Du; Singh, Ravinder
• Is Part Of: Obstetric medicine. Volume 12:Number 2(2019:Jun.)
• Page Start: 79
• Page End: 84
• Publication Date: 2019-06
• Subjects: HbA1c -- gestational diabetes mellitus; Pregnancy -- Complications -- Periodicals; Obstetrics -- Periodicals; 618.2
• DOI: 10.1177/1753495X18795984
• Languages: English
• ISSNs: 1753-495X

Abstract

This pilot study examined the use of early HbA1c in screening for gestational diabetes mellitus and adverse pregnancy outcomes in Singapore. One hundred and fifty-one pregnant women with a gestational age of under 14 weeks had an HbA1c test measured with their antenatal bloods prior to a second trimester oral glucose tolerance test. Patient characteristics and pregnancy outcome data were collected. Gestational diabetes mellitus prevalence was 11%. A receiver operating characteristic curve showed an HbA1c level of 5.2% (33 mmol/mol), had an 82% sensitivity, 72% specificity, 97% negative predictive value and 27% positive predictive value to predict gestational diabetes mellitus. Women with HbA1c of 5.2% (33 mmol/mol) or over 5.2% (33 mmol/mol) were older, had higher BMI and were less likely to be Chinese than those with HbA1c less than 5.2% (33 mmol/mol). There was no difference in pregnancy outcomes. Early HbA1c less than 5.2% (33 mmol/mol) may be useful to exclude low-risk Singaporean women from further testing, while those with HbA1c of 5.2% (33 mmol/mol) or greater would still need a oral glucose tolerance test between 24 and 28 weeks' gestation.