Calcium-to-creatinine ratio in pregnancy-induced hypertension

ObjectivesHypocalciuria has been correlated with preeclampsia. This study compared the calcium-to-creatinine ratio among the groups, and the correlation with the 24-h measurement of this ratio and a diagnosis of preeclampsia.Study designCase-control study including mild and severe preeclampsia, chronic hypertension and normal pregnancy.Main outcome measurementsThe calcium-to-creatinine ratio differentiates severe preeclampsia from mild preeclampsia, chronic hypertension and normal pregnancy.ResultsThere were statistically significant differences between the groups when comparing severe preeclampsia and chronic hypertension, severe preeclampsia and normal pregnancy, and mild and severe preeclampsia (p < 0.0001). The Spearman index between the calcium-to-creatinine ratio and 24-h calciuria was 0.65 (high correlation).ConclusionsThe calcium-to-creatinine ratio can reliably estimate 24-h calciuria, differentiating severe preeclampsia from mild preeclampsia, chronic hypertension and normal pregnancy.