Evaluation of transabdominal ultrasonography for ectopic pregnancy

Ultrasound examination was performed on 66 patients with suspected ectopic pregnancy. Of 23 women who had the diagnosis confirmed at laparotomy, 16 (69.6 per cent ) were correctly identified on ultrasound, 4 were reported as unliklely ectopic pregnancies and 3 were undetermined. Two patients with false negative ultrasound reports had positive findings on the ultrasound, but the findings were misinterpreted. Correct identification of these would have increased the true positive rate to 78.3 per cent and decreased the false negative rate to 8.8 per cent . There were 5 false positive reports due to overian cysts.