Baseline variability is assessed using a fetal heart rate monitor, typically during labor. The FHR tracing is observed over a 10-minute period, and the fluctuations are measured in beats per minute (bpm). Variability is classified into four categories:
Absent: No detectable fluctuation in the FHR baseline. Minimal: Fluctuations are Moderate: Fluctuations range from 6-25 bpm. Marked: Fluctuations are >25 bpm.
