NCC Certified Electronic Fetal Monitoring (C-EFM) Practice Exam

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What is the average difference in baseline FHR between 30 and 40 weeks?

5 bpm
10 bpm
15 bpm
20 bpm

The correct answer is: 10 bpm

The average difference in baseline fetal heart rate (FHR) between 30 and 40 weeks of gestation is approximately 10 beats per minute (bpm). As pregnancy progresses, fetal heart rate typically shows a trend toward a lower baseline. This change reflects the maturation of the fetal autonomic nervous system and is influenced by several factors including fetal activity, health, and the environment. At around 30 weeks, the baseline FHR is generally higher compared to what is observed at 40 weeks. A difference of about 10 bpm is commonly referenced in clinical practice, indicating a slight decrease as the pregnancy approaches full term. This decrease is considered normal and reflects the body's adaptations in response to the developing fetus. The number is derived from observational studies and is useful for healthcare providers in assessing fetal well-being in the later stages of pregnancy. Other options, such as a difference of 5 bpm, 15 bpm, or 20 bpm, do not align closely with the established data regarding FHR trends during this gestational timeframe.