Urinary calcium to creatinine ratio for predicting preeclampsia

Area of Science:

• Obstetrics and Gynecology
• Nephrology
• Clinical Chemistry

Background:

• Preeclampsia is a serious pregnancy complication characterized by high blood pressure and potential organ damage.
• Urinary calcium excretion is known to decrease in women with preeclampsia, a condition termed hypocalciuria.

Purpose of the Study:

• To investigate the predictive value of the urine calcium to creatinine ratio for preeclampsia in a cohort of young, primigravid patients.
• To assess whether hypocalciuria, indicated by a low calcium to creatinine ratio, can serve as an early marker for preeclampsia.

Main Methods:

• A prospective study involving 56 primigravid patients under 25 years old.
• Measurement of the calcium to creatinine ratio in spot urine samples.
• Statistical analysis comparing the ratio between normotensive and preeclamptic groups using receiver operator curve analysis.

Main Results:

• The mean calcium to creatinine ratio was significantly lower in the preeclamptic group (0.0475) compared to the normotensive group (0.1466; p < 0.0001).
• A cutoff ratio of 0.066 demonstrated a sensitivity of 75% and specificity of 86% for predicting preeclampsia.
• The positive and negative predictive values were 55% and 95%, respectively.

Conclusions:

• A single urine calcium to creatinine ratio measurement appears to be an effective and simple marker for predicting preeclampsia in high-risk populations.
• Hypocalciuria, as indicated by a low calcium to creatinine ratio, is a significant predictor of preeclampsia development in young, nulliparous women.