The publishing of papers on first-trimester Doppler.

Deals with the challenge faced by the editors of `Ultrasound in Obstetrics and Gynecology' journal in the publication of papers on the use of color and pulsed Doppler ultrasound in the first trimester of pregnancy. Information on the theoretical risks of Doppler examination for the fetus in the early first trimester of pregnancy; Policy adopted by the journal on Doppler studies in the first trimester.