RESUMO
Objective:To measure the normal range of inter-rectus distance in Han nationality women with normal gestational age and without a history of pregancy in central China by high-frequency ultrasound.Methods:A total of 561 Han nationality women with normal gestational age and without a history of pregnancy were continuously collected to perform transabdominal sonography from March 2018 to December 2019 in Henan Provincial People′s Hospital. The inter-rectus distance between superior margin of pubic symphysis and below the xiphoid process under rest condition was observed, and the widest distance between the inter-rectus distance was detected, also its distance with upper edge of umbilical level was confirmed. The 95% medical reference value(P95%) was adopted to confirm range of normal values of inter-rectus distance.Results:A total of 547 non-pregnant women were included in the study. The widest distance between the linea alba was mostly at the umbilical level. P95% for the inter-rectus distance was less than or equal to 29.00 mm.Conclusions:The ultrasounds can evaluate the inter-rectus distance in non-pregnant women. The widest inter-rectus distance in Han nationality women with normal gestational age and without a history of pregancy in central China is mostly at the upper edge of umbilical level. The critical point for the inter-rectus distance is 29.00 mm under rest condition.