really is, while the trace for FHR3 is recorded 20 bpm lower than it really is. The trace for FHR1 is
The following trace shows triplets with
The traces for FHR2 and FHR3 are offset. The numerical FHR values displayed on the monitor
remain unchanged. Subtract 20 from the recorded trace for FHR2 to obtain the true FHR2. For
example, if the recorded trace shows 160 bpm, then the true FHR is 140 bpm. Similarly, add 20 to the
recorded trace for FHR3 to obtain the true FHR3.
"Classic" Separation Order
To make differentiating the traces easier, the trace for FHR1 is offset by +20 bpm, and the trace for
FHR3 is offset by -20 bpm. In other words, the trace for FHR1 is recorded 20 bpm higher than it
The recorder prints a dotted line labeled +20 across the FHR scale, to identify the
trace for FHR2.
The recorder prints a dotted line labeled -20 across the FHR scale, to identify the
trace for FHR3.
The FHR trace is labeled every 5 cm.
The label for FHR2 is annotated with +20 and the FHR3 label is annotated with
13 Monitoring Triple FHRs
on, and using