biparietal diameter - #17390

I recently had an ultrasound done during my pregnancy, and the technician mentioned the biparietal diameter (BPD) of my baby, but I didn’t fully understand what it meant or how it affects the health of my pregnancy. I know the biparietal diameter is the measurement between the two sides of the baby's head, and it helps estimate the baby's size and growth, but I’m not sure what normal ranges are and what it tells about my baby’s development. At my 20-week scan, the BPD measurement seemed to be slightly above average, which made me wonder if this indicates anything specific. Could a larger BPD be a sign of a health issue, or is it just an indicator of the baby’s growth pattern? Does the biparietal diameter correlate with other measurements, like the abdominal circumference or femur length, to get a better idea of the baby’s size and gestational age? I also heard that measuring the BPD can help doctors identify certain conditions, such as hydrocephalus, which is when there’s excess fluid around the brain. I’m wondering if a larger BPD measurement is always a cause for concern, or if it’s just a normal variation depending on the baby’s position and growth stage. I’m curious about how accurate this measurement is in estimating the baby’s weight or predicting the timing of labor. My doctor mentioned that this is just one of many markers that are used to assess the baby’s health, but I’d like to understand how reliable the BPD measurement is in determining these factors. Has anyone here had an ultrasound with a biparietal diameter measurement that was larger or smaller than expected? How did your doctor explain the results, and did it affect your pregnancy or delivery in any way?