Ultrasound-guided placental bed biopsy in the first and second trimester.

An abstract of the medical research "Ultrasound-guided placental bed biopsy in the first and second trimester" is presented. It explains that the study aimed to determine whether adequate samples of the placental bed could be obtained transcervically with the use of biopsy forceps. It also mentions the use of ultrasound to determine gestational age and placental location.