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Today's obstetrician gynecologist is required to interpret and in many cases perform ultrasound scans in the first trimester.In fact, certification of residency programs in many countries requires documentation of adequate exposure to and training in the evaluation of first-trimester ultrasound.
Where no conclusion is possible alternative explanations for the ultrasound appearances may be offered.
This special transducer is introduced gently into the vagina.
Clearer images are obtained because the probe is of higher frequency and is nearer to the object of interest in the womb.
The gestational sac can be seen as early as four and a half weeks of pregnancy and a yolk sac at about five weeks.
A trans-vaginal probe has to be used to visualize the early pregnancy.