Pregnancy FHR and Dating
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- Measuring fetal heart rate using M-mode
- M is for motion – position one dimensional line on right
- Left pane shows time on X axis
- Measure 2 beats peak to peak by convention
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- This is Doppler
- Not needed
- Higher energy should be avoided in fetus
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- 1st trimester up to ~12 weeks use crown-rump length (CRL)
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- 2nd trimester >12 weeks recommend biparietal diameter (BPD)
- Measure outside of skull to inside of skull (leading edge method)
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