Which measurements are typically taken during the 1st trimester of pregnancy?

During the first trimester of pregnancy, the primary measurements taken are crown-rump length and gestational sac size. Crown-rump length is a crucial measurement as it provides an accurate estimate of the embryonic age because it reflects the development stage of the embryo. This measurement is typically used from around six to twelve weeks of gestation, and it helps in assessing growth and viability.

Gestational sac size is also evaluated during early ultrasounds to confirm the presence of a developing pregnancy and to estimate gestational age. Measuring the gestational sac allows healthcare providers to determine if the pregnancy is in normal range for its timeline, which assists in monitoring for potential complications.

These measurements are among the earliest indicators of pregnancy health and progress, making them essential components of the first-trimester assessment in sonography.