Pregnancy -

The estimated age of the pregnancy, calculated from the first day of your last menstrual period (LMP).

Measurement from the top of the head (crown) to the bottom (rump). This is the most accurate way to date a pregnancy in the first trimester. pregnancy

Reports are also used for administrative and diagnostic purposes beyond routine ultrasounds: The estimated age of the pregnancy, calculated from

The length of the baby's thigh bone, used to assess skeletal growth. Typical Findings by Stage The estimated age of the pregnancy

Doctors look for a gestational sac (the first sign of pregnancy) and a yolk sac (which provides nutrients until the placenta forms).