The separation of the right renal pelvis by 8.5mm in the labor test is usually a physiological factor, pregnant women do not need to worry too much, and regular labor tests can be done. The renal pelvis is the place where the kidney and the ureter are connected, the separation of the renal pelvis in the fetus is commonly caused by kidney stones or ureteral malformation that prevents urine from being discharged, and the renal pelvis is filled up and enlarged, normally the separation of the renal pelvis is not more than 10mm, the separation of the right renal pelvis found in the maternity test of 8.5mm is usually physiological, pregnant women don’t need to be overly worried, and can be regularly examined in the maternity test. If the separation of the renal pelvis is more serious and progressive, it may be due to kidney stones or ureteral malformation, and it is recommended to consult obstetricians and follow the doctor’s instructions for timely and standardized treatment.