Random urine protein-creatinine ratio to predict proteinuria in new-onset mild hypertension in late pregnancy

Abstract

Objective: The aim of this study was to evaluate the diagnostic accuracy of random urine protein-creatinine ratio for prediction of significant proteinuria (> or = 300 mg/24 h) in patients with new-onset mild hypertension in late pregnancy.

Methods: Medical records of 185 consecutive pregnant patients with new onset of mild hypertension in late pregnancy were reviewed. Random urine samples were taken before 24-hour urine collection. The predictive values of the random urine protein-creatinine ratio for diagnosis of significant proteinuria were estimated by using at least a 300-mg protein level within the collected 24-hour urine as the gold standard.

Results: Thirty-nine patients (21%) had significant proteinuria. There was a significant association between 24-hour protein excretion and the random urine protein-creatinine ratio (rs = 0.56, P <.01). With a cutoff protein-creatinine ratio greater than 0.19 as a predictor of significant proteinuria, sensitivity and specificity were 85% and 73%, respectively. Positive and negative predictive values of the test were 46% and 95%, respectively.

Conclusion: The random urine protein-creatinine ratio was a poor predictor for significant proteinuria in patients with new-onset mild hypertension in late pregnancy.