Screening for gestational diabetes in a high-risk population

Area of Science:

• Obstetrics and Gynecology
• Endocrinology
• Public Health

Background:

• Gestational diabetes mellitus (GDM) poses risks to both mother and fetus.
• The Navajo population exhibits a higher prevalence of GDM, necessitating targeted screening strategies.
• Optimal screening thresholds for GDM require further investigation in diverse populations.

Purpose of the Study:

• To evaluate the effectiveness of different glucose screening thresholds for GDM in pregnant Navajo women.
• To determine the incidence of GDM in this population based on various screening cutoffs.
• To assess the cost-effectiveness and diagnostic accuracy of screening protocols for GDM.

Main Methods:

• A cohort of 181 pregnant Navajo women underwent screening for GDM using a 50-g oral glucose challenge test.
• Two screening thresholds were analyzed: ≥7.2 mmol/L (130 mg/dL) and ≥8.3 mmol/L (150 mg/dL).
• Diagnostic accuracy metrics (sensitivity, specificity, positive predictive value) and cost per case detected were calculated. Logistic regression identified significant risk factors.

Main Results:

• The overall incidence of GDM was 6.1%.
• Screening with ≥7.2 mmol/L (130 mg/dL) yielded a positive predictive value of 0.25 and a cost of $114 per case.
• Screening with ≥8.3 mmol/L (150 mg/dL) showed higher specificity (0.58) and positive predictive value (0.39) at a cost of $106 per case. The screening test was a strong predictor of GDM diagnosis.

Conclusions:

• Universal screening for GDM is recommended for pregnant Navajo women.
• A screening threshold of ≥7.2 mmol/L (130 mg/dL) is advised for this high-risk population due to its association with GDM diagnosis.
• Further research may explore refining screening protocols to improve diagnostic accuracy and cost-effectiveness.