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OBJECTIVE To examine the psychometric properties of the nine-item Antepartum Gastrointestinal Symptom Assessment (AP-GI-SA) instrument. DESIGN Single-group prospective design. SETTING Urban prenatal clinic serving a diverse population. PARTICIPANTS Convenience sample of 45 pregnant women. METHODS Participants completed the AP-GI-SA before a scheduled prenatal care appointment. We used Bayesian structural equation modeling to evaluate the construct validity of the scale and assessed known-groups validity. We assessed reliability throug