according to a research letter in EClinicalMedicine.
The research team, led by Kara M. Rood, MD, of the department of obstetrics and gynecology at the Ohio State University, Columbus, said that their pragmatic study in 346 consecutive pregnant patients demonstrated that the test is not only inexpensive, but also easy to use and well received by the nursing staff. A positive Congo Red Dot Rapid Paper Test had 80% sensitivity, 89% specificity, 92% negative predictive value and 87% accuracy to correctly diagnose preeclampsia.
The patients were recruited from the labor and delivery triage unit at the Ohio State University Wexner Medical Center. Certain misfolded proteins typically are found in the urine of women with preeclampsia, so in prior research, the researchers had hypothesized that a urine test that could detect these proteins would carry “diagnostic and prognostic potential for” preeclampsia. The researchers were able to show that this was possible with a laboratory test that used Congo Red dye because those misfolded proteins bind with it. This current study explored the accuracy of a 3-minute, point-of-care urine test that uses a dot of Congo Red dye on a piece of paper.
Other serum and urine tests, which often have been more complicated or time intensive, have failed to gain traction in real-world practice, as well as in low-resource countries where mortality and morbidity from preeclampsia are highest, the authors noted. By contrast, the researchers hope the rapid paper test they studied in the current research will fulfill that unmet need.
The study was funded by the Saving Lives at Birth grant and a grant from the Eunice Kennedy Shriver National Institute of Child Health and Human Development.
SOURCE: Rood KM et al. EClinicalMedicine. 2019. doi: 10.1016/j.eclinm.2019.02.004.