Fetus thirty-eight weeks, right hydronephrosis 194mm usually can be observed first, after the birth of the fetus can follow the medical advice for surgical treatment. 1. Observation: Fetus 38 weeks, right hydronephrosis 194mm if there is no other abnormalities, then you can first observe, usually found in the fetal period of hydronephrosis, in a period of time may recover on their own, during the period of time according to the doctor’s instructions on time checkups, so as to observe the situation of the fetus. 2. Surgery: the fetus is usually full-term at thirty-eight weeks, if the fetus is born, there is still a right hydronephrosis of 194mm, which is usually due to abnormal renal function, and it can be treated with surgery according to the doctor’s instruction, such as pyeloplasty, laparoscopy, and so on. During the period of pregnancy, in order to observe the specific situation of the fetus, it is recommended to go to the hospital on time for examination, if the fetus is abnormal, then follow the doctor’s instructions to carry out the relevant treatment, so as to avoid affecting the healthy development of the fetus.