This is another test used to help evaluate the condition of your baby and is often done when a NST is non-reactive, or in some high-risk pregnancies to check whether the blood flow to the baby is adequate. Just like the NST, this test is done during the third trimester.
The CST measures your baby's heart rate in response to contractions of your uterus. The difference is that your doctor will be looking at the heart rate during uterine contractions, rather than in response to movements.
