6 to 25 beats per minute are the moderate range of the fetal heart rate variability.
What is Baseline Fetal Heart Rate (FHR)?
The baseline FHR is the heart rate across a segment of 10 minutes, rounded to the nearest 5 beats per minute, excluding periods of noticeable FHR variability, periodic or episodic variations, and baseline segments that deviate by more than 25 beats per minute.
The fetal heart rate should not vary by more than 2 cycles per minute; this is known as baseline variability. Long-term variability is not distinguished from short-term variability (also known as beat-to-beat variability or R-R wave period differences in the electrocardiogram).
Based on amplitude range (peak to trough), grades of fluctuation are assigned:
Amplitude range unnoticeable when there is no variability.
5 BPM is the minimum.
Moderate = 6 to 25 BPM.
>25 BPM as marked.
The most important intrapartum fetal compromise sign seems to be FHR variability that is consistently low or absent. However, a positive outcome may not always be predicted when there is good FHR variability.
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