Final answer:
A fetal heart rate of 180 beats per minute in the second trimester is an abnormal finding that requires further testing, as it may indicate fetal distress.
Step-by-step explanation:
In evaluating a primipara during her second trimester, an abnormal finding that would necessitate further testing is a fetal heart rate of 180 beats per min. While quickening, a consistent increase in fundal height, and Braxton Hicks contractions are normal occurrences during pregnancy, a sustained fetal heart rate above the normal range (which is typically 110 to 160 beats per minute) may indicate fetal distress or other complications. Such an elevated heart rate, especially if persistent, might necessitate additional monitoring or diagnostic testing to assess the health of the fetus.