Background: Threatened miscarriage is defined as any bleeding in the first half of pregnancy and is seen in about 20–25% of pregnancies therefore is a fairly common complication during pregnancy. Most of the time bleeding is a small amount, but sometimes it may be more serious and severe. About 50% of cases of threatened miscarriage terminate in complete miscarriage and loss of pregnancy. If pregnancy continues, the sub optimal events have been reported more; like preterm delivery and Preeclampsia. The aim of the study was to evaluate the pregnancy outcome in pregnancies with threatened abortion (miscarriage).
Methods: This prospective cohort study was conducted at the Department of Obstetrics and Gynecology, Al-Azhar University Hospitals on 70 pregnant women; 35 women (case group) had a history of vaginal bleeding during the first half of pregnancy and the other 35 women (control group) do not had this history. Each case in the study was subjected to the following: Detailed obstetric and gynaecological history. Clinical examination. Gestational age according to the last menstrual period and ultrasound findings. The following pregnancy outcomes between the two groups were compared: abortion, preterm delivery, IUGR, IUFD, PPROM, LBW, preeclampsia, type of delivery.
Results: There was statistically significant difference between Cases and Control regarding (abortion, preterm labour and PPROM). There were no statistically significant difference between Cases and Control regarding (age, preeclampsia development, IUGR, IUFD, LBW, placenta previa, low lying placenta, NICU admission and type of delivery).
Conclusion: Pregnant women with threatened abortion are at increased risk for spontaneous loss and adverse pregnancy outcomes. Current study reports that patients with history of vaginal bleeding during the first half of pregnancy are at a risk for spontaneous pregnancy loss and adverse pregnancy outcomes. For patients who reported vaginal bleeding during the first trimester, high risks of abortion, LBW, preterm delivery, PPROM, and low lying placenta were observed. These associations are clinically significant since they denote increased morbidity and mortality.
Keywords: Threatened miscarriage –pregnancy- outcome.

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