Association of Obstetric and Neonatal Outcomes With Deviation From Guidelines for Gestational Carriers.

OBJECTIVE: To evaluate whether deviation from American Society for Reproductive Medicine (ASRM) safety guidelines for women who are gestational carriers is associated with increased risk of severe obstetric and perinatal morbidity and mortality.

METHODS: This is a cross-sectional study of births from gestational carrier pregnancies in Utah from 2009 to 2018 with data collected from birth certificates. Deviations from ASRM guidelines include women aged younger than 21 years or older than 45 years, nulliparity, prior stillbirth, tobacco or percutaneous drug use, more than five prior deliveries, more than three prior cesarean deliveries, major comorbidities, and mental health conditions. The primary outcome was a composite of severe obstetric morbidity and mortality (death within 1 year of delivery; intensive care unit admission; eclampsia; hemolysis, elevated liver enzymes, and low platelet count (HELLP) syndrome; transfusion; unplanned hysterectomy). Secondary outcomes were cesarean delivery, gestational diabetes mellitus, hypertensive disorders of pregnancy, preterm delivery (analyzed per pregnancy), and a composite neonatal outcome. Associations were analyzed using descriptive statistics and multivariable logistic regression.

RESULTS: A total of 361 gestational carrier deliveries of 435 neonates were included in this analysis. Sixteen percent (58/361) of pregnancies did not meet guidelines. Rates of severe obstetric morbidity or mortality did not differ between gestational carrier pregnancies that deviated from guidelines and those that did not (1.7% for both, odds ratio [OR] 1.04, 95% CI 0.12-9.12). Rate of cesarean delivery was higher among pregnancies that deviated from guidelines (36.2% vs 23.4%, OR 1.85, 95% CI 1.02-3.37). Rates of gestational diabetes mellitus and hypertensive disorders of pregnancy did not differ. Preterm delivery was also more common among pregnancies that deviated from guidelines, particularly after controlling for multifetal gestation (36.2% vs 23.4%, adjusted OR 2.16, 95% CI 1.04-4.48). Neonatal complications were significantly more common in pregnancies that did not meet guidelines, even after adjusting for gestational age and multifetal gestation (adjusted OR 3.66, 95% CI 1.44-9.29).

CONCLUSION: Nearly one in five gestational carrier pregnancies in this cohort did not meet ASRM guidelines. Deviation from guidelines is associated with increased rate of cesarean delivery, neonatal morbidity, and preterm birth. Future research should focus on the safety of women who are gestational carriers and on why deviation occurs.