Assessment of Diagnostic Value of Non-Stress Test NST in High-Risk Pregnancies

Backgrounds: Non-stress test is the most widely used technique for screening and evaluating primary fetal health during pregnancy, which is based on accelerating heart rate in response to fetal activity. The aim of this study was to determine the diagnostic value of non-stress tests (reactive and non-reactive) in the outcomes of high risk pregnancy.Material and Method :A cross-sectional study was conducted on pregnant mothers of the third trimester of pregnancy and gestational age of 41 to 28 weeks. After obtaining informed consent, women with high-risk pregnancy were subjected to non-stress tests. When in 20 minutes monitoring the heartbeat of the fetal, there were at least 2 movements leading to increased heart rate, In this case, the non-stress test is reactive and otherwise non-reactive or abnormal (negative). Data was entered into the spss-16 software and was analyzed statistically.Result: There was a statistically significant difference between the two groups of reactive and non-reactive NST responses in low apgar score (p= 0.023), Heart rate decrease (P=0.045), Need for recovery (P= 0.034), Emergency cesarean section (P=0.011) and need for admission to NICU (P=0.045). However, there was no significant difference between the two groups (P = 0.188). In 83.3% of the cases, there was a favorable outcome of pregnancy. The optimal outcome of pregnancy is higher in non-reactive test (29.85% vs. 16.79%).Conclusion: When NST is used, observe the embryo sleep timing and maternal prescription and the age of the fetus, and in cases where the non-stress test is non-reactive, wait a bit longer, repeat testing, or another supplementary test.