What is the most appropriate follow-up intervention for a 35-year-old primigravida with abnormal triple screen test results?

The most appropriate follow-up intervention for a 35-year-old primigravida with abnormal triple screen test results is to order an ultrasound. The triple screen test is a maternal serum screening that evaluates the risk for certain genetic disorders and congenital anomalies, including Down syndrome and neural tube defects. When the results are abnormal, further evaluation is critical to assess the health of the fetus and to confirm or rule out potential issues.

An ultrasound is a non-invasive imaging technique that allows healthcare providers to visualize the fetus's anatomy and assess for any structural abnormalities that may explain the abnormal screening results. It can provide valuable information regarding the gestational age, fetal growth, and can identify potential complications, such as placental issues or congenital anomalies.

In contrast, a computed tomography (CT) scan of the abdomen would typically not be used in this scenario, as CT scans involve radiation exposure which is generally avoided during pregnancy unless absolutely necessary. A 24-hour urine collection for protein clearance is more relevant in assessing conditions like preeclampsia and would not directly address the findings related to the triple screen test results. Assessing for a history of illicit drug or alcohol use, while important in a comprehensive evaluation of a pregnant patient, does not specifically follow up on the abnormal