Abstract
Abstract. 99 pregnant women, 5 to 11 weeks, were examined by a combined ultrasonic B‐scan and Doppler method to detect fetal heart activity. The fetus was localized accurately by B‐scanning and the heart activity was detected through the mother's abdominal wall with 100% certainty at eight weeks of pregnancy (menstrual age). The earliest fetal heart activity detected was in a pregnancy which dated 44 days from the last menstrual period. Positive findings were recorded on tape and photographed from the oscilloscope screen.
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