A Doppler ultrasound is a noninvasive diagnostic procedure that uses circulating red blood cells to reflect high-frequency sound waves (ultrasound) to assess the blood flow via your blood arteries. Normal ultrasounds employ sound waves to create pictures, but they are unable to depict blood flow. A BPP, also known as an ultrasound-biophysical profile, is performed during the final three months of pregnancy. A BPP may be performed as early as the 32nd to 34th week of pregnancy if the baby is, by chance, having issues throughout the mothers pregnancy. In the third three months of their pregnancy, certain women with high-risk pregnancies are required to have a BPP test either once a week or twice a week. Throughout pregnancy, a biophysical profile (BPP) test monitors the foetus health. A BPP exam may include a non-stress test with foetal ultrasonography and electronic foetal cardiac monitoring. The babys heart rate, muscle tone, movement, breathing, and the amount of amniotic fluid in close proximity to the infant are all noted in the BPP.