Is a fetal heart rate of 161–166 beats per minute normal, and what should be done?

A fetal heart rate of 161–166 beats per minute may be normal, but if caused by fetal hypoxia, it is considered abnormal and requires oxygen therapy. Detailed analysis is as follows:

1. Normal

The normal fetal heart rate ranges from 120 to 160 beats per minute. However, fetal heart rate can vary—for example, when the pregnant woman is anxious or during fetal movement, the heart rate may temporarily increase. During fetal heart rate monitoring, rates between 161 and 166 beats per minute may occur. This is considered a normal phenomenon and typically does not require special intervention; regular follow-up observation is sufficient.

2. Abnormal

If the fetal heart rate remains between 161 and 166 beats per minute, it may indicate early fetal hypoxia, which is an abnormal sign. In such cases, prompt medical evaluation is necessary. If intrauterine fetal hypoxia is confirmed, oxygen therapy under medical guidance should be administered. Increasing maternal blood oxygen levels will gradually restore the fetal heart rate to normal.

In addition, while monitoring fetal heart rate, it is also important to pay attention to fetal movements. Any abnormalities should be evaluated by a healthcare provider immediately.