What does a fetal skeleton visible on X-ray indicate?

A visible fetal skeleton on X-ray is indeed considered a positive sign of pregnancy. This finding typically occurs during the later stages of pregnancy when the fetal bones have developed sufficiently to be seen on imaging studies. It indicates that the fetus is growing and has reached a point of maturity where ossification of the bones is taking place, which is an expected part of a healthy pregnancy.

While options such as the pregnancy being at risk, the baby being overdue, or the mother requiring immediate care may all be considerations in specific contexts, they do not directly relate to the presence of a visible fetal skeleton. Instead, this imaging finding primarily suggests that pregnancy is progressing well and is a reassuring indicator of fetal development.