Which indicator is used to assess symmetric IUGR?

The ponderal index is used to assess symmetric intrauterine growth restriction (IUGR) because it provides a ratio that captures the relationship between a baby's weight and height, thereby evaluating their overall growth pattern. In symmetric IUGR, the growth restriction affects both length and weight proportionally, meaning the infant is smaller in both dimensions, which is best reflected by the ponderal index.

This index is particularly useful in cases of symmetric IUGR, where the proportion of body fat and muscle mass is typically preserved, allowing for a clearer understanding of the infant's growth status compared to other methods that may focus on only one dimension. The ponderal index offers insight into whether the growth is appropriately matched or has been adversely affected during pregnancy.

Other indicators like growth hormones, fetal heart rate, or body mass index do not specifically target the proportionate relationship between weight and length in the context of IUGR, thus making them less suitable for this particular assessment.