Pelvic Pelvimetry (Pelvic Measurement)

What Is Pelvimetry?

Pelvimetry evaluates the anatomical structure of the pelvis, focusing on key measurements like the pelvic inlet, outlet, and transverse diameter. These measurements are critical for assessing fetal head size compatibility with maternal pelvis during labor. The test often uses imaging techniques like X-rays or ultrasound to capture these details.

Why Is Pelvimetry Done?

Pelvimetry is performed primarily in pregnant women to evaluate the likelihood of a vaginal birth. It helps identify if the pelvis is large enough to accommodate the baby’s head, which can influence decisions about delivery methods. High-risk pregnancies, previous cesarean sections, or concerns about fetal positioning may prompt this evaluation.

How Is Pelvimetry Performed?

Pelvimetry typically involves imaging studies such as X-rays (pelvic X-ray) or ultrasound. In X-ray pelvimetry, specific pelvic landmarks are measured to determine dimensions like the conjugate (distance between pelvic bones), diagonal conjugate, and transverse diameter. Ultrasound pelvimetry uses fetal head measurements to estimate pelvic compatibility.

What Does Pelvimetry Tell You?

The results help classify the pelvis into categories (e.g., normal, restrictive) and compare them to the estimated fetal head size. If the pelvis appears too narrow or the fetal head too large, doctors may recommend a cesarean section to reduce risks of complications during vaginal delivery.