Comparison with contraction stress test (CST)
- Contraction stress test (CST) is another screening test that measures FHR response to uterine contractions induced by oxytocin or nipple stimulation. It is used to evaluate fetal tolerance of labor and placental function.
- The main difference between NST and CST is that CST causes stress to the fetus by inducing contractions, while NST does not. Therefore, CST has more risks and contraindications than NST, such as preterm labor, placental abruption, or uterine rupture.
- The main similarity between NST and CST is that they both assess FHR patterns and their relation to fetal oxygenation. A negative CST result means that there are no late or significant variable decelerations in FHR during contractions, indicating a healthy fetus. A positive CST result means that there are late or significant variable decelerations in FHR during contractions, indicating fetal compromise.
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