Abnormal BPD measurements can indicate several potential issues: - Large BPD: This might suggest fetal macrosomia, which can lead to complications during delivery. - Small BPD: This could be indicative of IUGR, which requires closer monitoring and potential intervention. - Discrepancies in BPD and other measurements: Significant differences between BPD and other fetal measurements may suggest congenital anomalies or syndromes.