INTRODUCTION: Hyponatremia, although common in expectant women with preeclampsia, has not been well studied in a multicenter fashion, and it is unknown whether it is associated with adverse events related to severe preeclampsia. Our primary objectives are to assess the clinical characteristics and emergency therapy applied to participants diagnosed with preeclampsia. We hypothesize that hyponatremia present in preeclamptic patients with severe features is associated with greater use of emergency hypertensives, antenatal steroids, and cesarean delivery. METHODS: This is a retrospective cohort study utilizing a multicenter electronic health record database (TriNetX). We collected and evaluated the following data of participants aged 15–54 years with a diagnosis of preeclampsia with severe features: demographics, diagnostic codes, medication codes, procedure codes, deaths, and laboratory results. RESULTS: A total of 2,901 participants (215 [7.4%] with a sodium level below 134 mEq/L and 2,686 [92.6%] with a sodium level above 135 mEq/L) were included. A higher proportion of participants in the below 134 sodium group received emergency antihypertensives (165 [76.7%] versus 1,811 [67.4%]; P=.01), antenatal steroids (103 [47.9%] versus 953 [35.5%]; P=.001), and cesarean section (27 [12.6%] versus 97 [3.6%]; P<.001). CONCLUSION: We found that hyponatremia may be associated with emergency antihypertensive use, antenatal steroid use, and cesarean section in patients with preeclampsia with severe features. Future research is needed to determine whether routine sodium levels assessed in preeclamptic subjects with severe features identify subjects at risk of receiving these treatments.