Final answer:
Blood tests, particularly for syphilis, are recommended at every prenatal visit to monitor the health of the mother and fetus and to prevent complications.
Step-by-step explanation:
At every prenatal visit, a blood test should be conducted. For example, testing for syphilis is recommended at the first prenatal visit due to the high risk of fetal infection and possible fetal death. All pregnant women should be tested, with high-risk women undergoing additional testing in the third trimester and at delivery. If a pregnancy is confirmed, pregnant individuals are also advised to monitor key aspects of their health such as nutrient intake (e.g., folic acid) and exercise routines to ensure both their well-being and the development of the fetus.