Abstract
Background: The Centers for disease control and prevention, and the World Health Organization all define abortion as pregnancy termination before 20 week gestation or with fetus born weighing <500g [1]. Early pregnancy USG parameters: - fetal crown-rump length (CRL), the presence/absence of sub-chorionic hematoma and Fetal Heart Rate (FHR) are good predictors of outcome.
 Material and Methods: The study was conducted in the Department of Obstetrics and Gynaecology, S.P. Medical College Bikaner& associated Group of Hospital, Bikaner, Rajasthan. This is a hospital based prospective comparative study. The study group comprise of pregnant females attending Obstetrics and Gynaecology OPD. A total of 200 pregnant women are examined in this study. We divided these patients into 2 groups i.e group A and group B. Group A consists of 100 pregnant females with threatened abortion and group B with 100 normal pregnant female.
 Results: FHR at 115bpm is 76.32% sensitive, 90.32% specific in predicting abortion with 82.86% positive predictive value and 86.15% negative predictive value. While CRL at 11 mm is 50% sensitive, 69.35% specific in predicting abortion with 55% positive predictive value and 69.35% negative predictive value. 
 Conclusion: FHR is best predictive marker followed by presence or absence of sub-chorionic hematoma and CRL in threatened abortion which results in loss of pregnancy.
 Keywords: Pregnancy, Abortion, Threatened, USG
Highlights
The Centers for disease control and prevention, and the World Health Organization all define abortion as pregnancy termination before 20 weeks gestation or with fetus born weighing
Material and Methods: The study was conducted in the Department of Obstetrics and Gynaecology, S.P
Fetal Heart Rate (FHR) is best predictive marker followed by presence or absence of sub-chorionic hematoma and crown-rump length (CRL) in threatened abortion which results in loss of pregnancy
Summary
The Centers for disease control and prevention, and the World Health Organization all define abortion as pregnancy termination before 20 weeks gestation or with fetus born weighing
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