Magnetic Resonance Imaging: A New Tool to Optimize the Prediction of Fetal Anemia?

Introduction: The false-positive rate in the prediction of fetal anemia is 10–15%. We investigated if a new, noninvasive MRI method used as a supplement to ultrasound could improve the prediction. Methods: Fetuses suspected of anemia and controls were scanned in a 1.5-tesla MRI scanner 1–4 times during pregnancy. Cases were scanned before and after intrauterine blood transfusion with a T1-mapping MRI sequence in a cross-section of the umbilical vein. Results: Inclusion of 8 cases and 11 controls resulted in 10 case scans (2 cases were included twice) and 33 control scans. In controls, the T1 relaxation time was 1,005–1,391 ms; in cases with severe anemia, 1,505–1,595 ms, moderate anemia 1,503–1,525 ms, and no/mild anemia 1,245–1,410 ms. After blood transfusions, values dropped to 1,123–1,288 ms. The mean value in moderate and severe anemic cases was 275 ms higher than in controls (95% CI 210–341 ms, p < 0.0001), and after blood transfusion it was comparable to controls (3 ms, 95% CI –62 to 68 ms, p = 0.934). A 1,450-ms cut-off would have identified all cases in need of blood transfusion with no false-positive cases. Conclusions: Our findings indicate a potential for this new MRI method to improve the prediction of fetal anemia as a supplement to ultrasound.