During the second trimester of pregnancy, which abnormal finding in a primipara would necessitate further testing?

In the context of fetal monitoring during the second trimester, a fetal heart rate of 180 beats per minute is concerning and suggests a potential problem. The normal fetal heart rate typically ranges from 120 to 160 beats per minute. A rate above 160 beats per minute is classified as tachycardia, and when it reaches 180 beats per minute, it indicates a need for further evaluation. This elevated heart rate can signal possible fetal distress, maternal fever, or other complications that warrant additional testing to ensure the well-being of both the mother and the fetus.

In contrast, a fetal heart rate of 150 beats per minute falls within the normal range and does not require further intervention. Mild abdominal cramping can also be common during pregnancy and does not necessarily indicate a serious issue unless accompanied by other alarming signs. Similarly, intermittent back pain may be a normal discomfort experienced during pregnancy and, on its own, does not call for further testing unless it presents with other concerning symptoms. Thus, the presence of a significantly elevated fetal heart rate is the key factor prompting the need for additional investigation.