Category I |
All of the following criteria must be present. Tracings meeting these criteria are predictive of normal fetal acid-base balance at the time of observation. |
Baseline rate: 110 to 160 bpm |
Moderate baseline FHR variability |
No late or variable decelerations |
Early decelerations may be present or absent |
Accelerations may be present or absent |
Category III |
Category III tracings are predictive of abnormal fetal acid-base status at the time of observation. Prompt evaluation is indicated and most parturients will require expeditious intervention, such as change in position, treatment of hypotension, and discontinuation of any uterotonic drugs being administered. Category III tracings include either (1) or (2) below. |
(1) Absent baseline FHR variability and any of the following: |
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(2) Sinusoidal pattern |
Category II |
FHR tracing does not meet criteria for either category I or III and is considered indeterminate. |
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