Exploring maternal hydration status for safe and healthy pregnancy outcomes

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This prospective cohort study explored indices for evaluating maternal hydration status. The indices included bioimpedance values that were evaluated using a multifrequency bioelectrical impedance analyzer. Data from 332 participants, who were healthy singleton pregnant women, were analyzed.Higher resistance (R) values or higher hemoglobin (Hb) values, suggesting lower hydration status and lower plasma volumes, were found in a "suspected preterm labor (SPTL)" and a "low birth weight (LBW)" groups. Lower R values and higher Hb values, suggesting higher hydration status and lower plasma volumes, were found in a "elevated blood pressure after 34-36 weeks of gestation through to delivery (EBP)" group. Possible correlations of indices, related to maternal hydration status, with negative pregnancy outcomes were found in this study. Future studies are needed to explore the indices for evaluating maternal hydration status and for indicating healthy pregnancy outcomes.