How thick does a scarred uterus have to be to require a C-section?

Patient's question:

Wondering how thick a scarred uterus generally needs to be for a cesarean delivery? If enduring a vaginal birth, would it pose a life-threatening risk to the pregnant woman or baby? What are the reasons behind a thicker uterus?
Desired assistance: How thick does a scarred uterus need to be for a cesarean?

Doctor's answer:

Generally speaking, after a cesarean section during the first pregnancy, the likelihood of a second delivery is very low, because the thickness of the scarred uterine wall is 0.25 - 0.28 meters, which is too thin to allow for a smooth delivery. It should be noted that if the thickness is less than 3 millimeters, the two children usually need to be delivered earlier by half a month. During rapid delivery, in order to ensure a smooth delivery, the thickness must be below 5 millimeters. Therefore, when choosing a natural delivery, we must make measurements. If it is thinner, a cesarean section is necessary.

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