How to read a fetal heart rate tracing
Other platforms explain it with text and video. In VMS you practice it on the patient.
Fetal monitoring shows how well the baby is coping with labor. Reading every tracing in the same order keeps you from missing a worrying pattern.
Step by step
Check the setup
Confirm the date, time and paper speed, and make sure the line is the baby and not the mother's pulse. Note the weeks of pregnancy. [1]
Count the contractions
Count contractions per 10 minutes, averaged over 30 minutes. More than 5 is too many (tachysystole). [2]
Find the baseline rate
Estimate the average rate over 10 minutes, leaving out rises and drops. Normal is 110 to 160 beats per minute. [2]
Judge the variability
Look at how much the line wiggles. Moderate variability (6 to 25 beats per minute) is reassuring; absent or minimal variability is a concern. [2]
Look for accelerations
Rises of 15 beats for 15 seconds (10 for 10 before 32 weeks) are a good sign of a well-oxygenated baby. [2]
Classify the decelerations
Early drops mirror the contraction and are harmless. Late drops start after the peak and suggest poor placental flow. Variable drops are sudden and suggest cord compression. [2]
Assign a category and act
Put the tracing in Category I, II or III. Report Category II and III to the team at once and document your read. [1]
Common errors
- Mistaking the mother's pulse for the fetal heart rate.
- Calling late decelerations harmless because they are shallow.
- Ignoring a loss of variability.
Three-tier fetal heart rate categories (NICHD) [2]
| Category | Key features | Meaning |
|---|---|---|
| Category I | Baseline 110 to 160, moderate variability, no late or variable decelerations | Normal; routine monitoring |
| Category II | Anything that is not Category I or III | Indeterminate; evaluate and watch closely |
| Category III | Absent variability with recurrent late or variable decelerations or slow heart rate, or a sinusoidal pattern | Abnormal; act promptly |
Practice it in VMS
In VMS you do this on the patient, not on paper: every step goes on the checklist with a score, and in Teach mode Blocky tells you what comes next.
VMS cases that train this skill
Sources
Facts and steps follow AAMC Core Entrustable Professional Activities (Core EPAs); NCCPA PANCE Content Blueprint. VMS is not affiliated with these organizations. Updated: 2026-10-11.