A nurse is preparing to measure the baseline fetal heart rate (FHR) on a client in labor. Which of the following statements is NOT accurate regarding baseline fetal heart rates?

Choice A rationale A normal baseline fetal heart rate (FHR) range of 110-160 beats per minute reflects adequate fetal oxygenation and well-being. Deviations outside this range, such as sustained tachycardia or bradycardia, can indicate fetal distress or other physiological compromise requiring further assessment and intervention to ensure optimal fetal outcomes. Choice B rationale Fetal heart rate can be effectively obtained through both ultrasound, which provides a visual and auditory assessment, and auscultation using a Doppler device or a fetoscope. Both methods allow for accurate determination of the FHR, with ultrasound offering additional visual data on fetal movement and position. Choice C rationale Assessing the baseline FHR over a 10-minute period helps establish a true baseline by minimizing the influence of transient accelerations or decelerations. This longer observation window allows for a more accurate evaluation of fetal well-being and the presence of any significant FHR patterns, providing a reliable reference for ongoing monitoring. Choice D rationale Obtaining a reliable baseline FHR during contractions is inaccurate because contractions transiently affect fetal heart rate, causing decelerations or accelerations that do not reflect the true resting FHR. The baseline should be determined during a period of uterine quiescence to avoid misinterpretation of fetal well-being, as uterine activity introduces variability.