3-D Ultrasound – Uses specially designed probes and software to generate 3-D images of the developing fetus.
4-D or Dynamic 3-D Ultrasound – Uses specially designed scanners to look at the face and movements of the baby prior to delivery.
If you receive an ultrasound exam after week 6, your healthcare provider will begin to be concerned, if there is no gestational sac.
Your healthcare provider will use hormone levels in your blood, the date of your last menstrual period and, in some cases, results from an ultrasound to generate an estimated gestational age.
The sound waves bounce off bones and tissue returning back to the transducer to generate black and white images of the fetus.
Ultrasounds may be performed at any point during pregnancy, and the results are seen immediately on a monitor during the procedure.
Advanced Ultrasound – This exam is similar to the standard ultrasound, but the exam targets a suspected problem and uses more sophisticated equipment.
Doppler Ultrasound – This imaging procedure measures slight changes in the frequency of the ultrasound waves as they bounce off moving objects, such as blood cells.
The long-term effects of repeated ultrasound exposures on the fetus are not fully known.
It is recommended that ultrasound only be used if medically indicated. The heartbeat may not be detected for reasons that include: tipped uterus, larger abdomen, or inaccurate dating with last menstrual period.
There are basically seven different ultrasound exams, but the basic process is the same.