Does lying flat affect the results of fetal monitoring?

Patient's question:

Today I'm 37 weeks pregnant. During the fetal monitoring, there were a few movements at first, but then they stopped. They stayed motionless for a long time, and during the process, the doctor even stimulated the fetus. After the stimulation, the only movement I could feel was still just one. The results showed that FHR1 did not meet the Dawes/Redma standards within 22 minutes, with a baseline heart rate of 149 bpm, no high variability, 16 points of low variability, 5.6 milliseconds of short-term variability, and the failure reason was the absence of high variability. NST score was 8-9. However, while waiting outside, the fetus was quite active. Once I got off the bed after the test, he started moving again, but it was only during the part when I was lying on the bed that the check was conducted.

Doctor's answer:

Analysis of the condition: Hello; Based on your main complaints and symptoms; If it was detected while lying flat,
Guidance: Amniotic fluid will give an error in the results! To rule out this issue, it is necessary to rule out the presence of amniotic fluid. As long as the amniotic fluid is normal, there is generally no problem. Regarding the issue of fetal oxygen intake, it needs to be determined based on the examination results. Generally, excessive oxygen flow can cause fetal malformation and poisoning. Weigh the pros and cons before acting!

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