2Scroll Compressor History and Development 2OPERATING PRINCIPLES................................ 3Geometry of a Scroll....................................... 3The Scroll Set ................................................. 3Compression Process ...................................... 4Compliance .....................................................
A: Your baby's heartbeat is one of the first things your doctor will look for on an ultrasound, a test that uses sound waves to give off visual images of your baby and placenta as well as your uterus and other pelvic organs.
As a general rule, 5.5 to 6.5 weeks is the earliest time that your doctor will be able to detect a fetal heart beat by trans-vaginal ultrasound. In other words, about six weeks is the earliest stage where you can hear your tiny babyâs heartbeat with an ultrasound. At that early phase, your babyâs heart rate should be about 100 beats per minute.