Is a fetal heart rate of 166 beats per minute at 23 weeks of pregnancy normal?

At 23 weeks of gestation, a fetal heart rate of 166 beats per minute is generally normal if it is transient, but abnormal if persistent. Specific analysis is as follows:

1. Normal

Under normal circumstances, the typical fetal heart rate range at 23 weeks of pregnancy is 120–164 beats per minute. A fetal heart rate of 166 beats per minute may be considered normal if it is temporary and caused by external factors such as maternal physical activity.

2. Abnormal

If a fetal heart rate of 166 beats per minute occurs frequently or remains consistently at this level, it is generally considered abnormal and could indicate fetal intrauterine hypoxia. Increased vigilance and prompt medical intervention are recommended.

When the above conditions occur, patients should promptly visit the obstetrics and gynecology department of a hospital, undergo necessary examinations under a physician's guidance to determine the underlying cause, and receive timely, targeted treatment.