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A non-stress test (NST) is primarily designed to assess the fetal heart rate response to movement. This test is non-invasive and typically performed during the third trimester of pregnancy to ensure the well-being of the fetus. During an NST, the fetal heart rate is monitored, and the healthcare provider looks for accelerations in the heart rate that coincide with the fetus's movements. A healthy fetus will generally show a reactive heart rate pattern—indicating that oxygen levels are adequate and suggesting that the autonomic nervous system and overall fetal health are functioning well.

The other options, while related to pregnancy monitoring, do not capture the specific purpose of an NST. Monitoring maternal blood pressure is important for assessing the mother's health, particularly concerning conditions like preeclampsia, but it is not the focus of an NST. Evaluating uterine contractions is part of labor monitoring rather than fetal heart rate assessment, and identifying fetal weight typically requires ultrasound rather than a non-stress test. Thus, the purpose of an NST is solely to evaluate how the fetal heart responds to its own movements, making it a crucial tool for fetal health assessment.