When does pregnancy start to have amniotic fluid

Patient's question:

No

Doctor's answer:

Hello: Generally, amniotic fluid is present around 8 weeks of pregnancy. In the early stages, the amniotic fluid is a dialysate that enters the amniotic cavity through the fetal membrane from the maternal serum. At 8 weeks of pregnancy, the amount of amniotic fluid is approximately 5-10 ml. After 16-18 weeks of pregnancy, the only source of amniotic fluid is the fetal urine. At this time, the amount of amniotic fluid increases, and the normal range for the depth of amniotic fluid is between 3.0-8.0 cm, while the amniotic fluid index is between 8.0-18.0 cm. If the amniotic fluid is normal, there is no problem.