Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Right-hand rule of thumb for transabdominal scanning. The palm of the right hand corresponds to the fetal abdomen, the dorsal side of the forearm to the fetal back, and the fist to the fetal head. The direction of the thumb always corresponds to the left side of the fetus.
