Hi! BPS ultrasound is the biophysical profile ultrasound, ginagamit nila yan usually in the third trimester or when there are concerns, to check kung okay ang baby (movement, breathing, amniotic fluid levels, placenta, at heart rate). A few of my mum friends had it done kasi may gestational diabetes or high blood pressure sila, and honestly parang mas detailed siya compared sa regular ultrasound, so you get more peace of mind na lahat is good with baby. Ask your OB kung bakit nire-recommend niya sa iyo, kasi may specific reason talaga yan, it's not routine for everyone!