问题描述：怀孕31周3彩超报告,BPD81mm.HC285mm.AC267mm.FL59mm.瞬间HR153次/分,羊水最大深度约57mm.脐动脉Vs37.8cm/s.Vd14.5/s.S/D2.6RI0.62PI0.91胎儿颈部横断面可见彩环状脐带血流,这正常吗
胎心正常，羊水正常，胎儿的头属于范围。胎儿有脐带绕颈。胎心正常，羊水正常，胎儿的头属于范围。胎儿有脐带绕颈。