Diagnostic Value of Urinary Microalbumin Level in Postpartum Acute Kidney Injury

Background: We aimed to explore the diagnostic value of urinary microalbumin (mALB) level in postpartum acute kidney injury. Methods: A total of 127 maternity patients were selected from December 2013 to January in 2016 in Binzhou Central Hospital, Binzhou, Shandong, China and divided into two groups: the kidney injury and normal kidney group. The dynamic changes and diagnostic value of urine microprotein in postpartum acute kidney injury were analyzed. Results: The postpartum mean arterial pressure of maternity patients in the kidney injury group was 104.3 ± 11.6 mmHg, which was significantly higher than that of the normal kidney group ( P <0.05). The mean age of the kidney injury group was 32.3 ± 11.6 years, which was significantly higher than that of the normal kidney group ( P =0.006). In the kidney injury group, the postpartum glomerular filtration rate (GFR) was 78.4 ± 11.5 mL/min, which was significantly lower than the normal group ( P =0.001), and urinary microalbumin was 2.87 ± 1.24 mg/mmol·Cr. The difference was statistically significant ( P =0.002). mALB/GFR, Cr, urinary mALB, and GFR were the independent risk factors of postpartum acute kidney injury. The area under the ROC curve for mALB/GFR was 0.759, whereas the area under the ROC curve for Cr was 0.681, which was smaller ( P = 0.042). The area under the ROC curve of mALB was 0.785 ( P =0.027), which was close to the area under the ROC curve of mALB/GFR. Conclusion: Urinary mALB test is noninvasive and has high diagnostic value for postpartum kidney injury.