A nurse is providing instruction to a client about diagnostic tests during their first prenatal visit at 12 weeks of gestation.
Which of the following diagnostic tests should the nurse include in the teaching?

Choice A rationale

Increased leukorrhea, or vaginal discharge, is a common and normal physiological finding during pregnancy due to increased estrogen levels and blood flow to the vaginal area. This increase in discharge helps prevent ascending infections. Unless accompanied by itching, odor, or color changes, it typically does not indicate a problem.

Choice B rationale

Urinary frequency is a common symptom in late pregnancy, particularly in the third trimester. It results from the enlarging uterus compressing the bladder, reducing its capacity, and increasing renal blood flow and glomerular filtration rate, leading to increased urine production. It is a normal physiological adaptation.

Choice C rationale

A persistent headache in a pregnant client, especially in the third trimester, is a priority to assess further because it can be a sign of preeclampsia, a serious hypertensive disorder of pregnancy. Other symptoms of preeclampsia include visual disturbances, right upper quadrant pain, and proteinuria. Early identification is crucial for intervention.

Choice D rationale

Insomnia is a common complaint during the third trimester of pregnancy. It can be attributed to various factors such as physical discomfort, frequent urination, fetal movements, anxiety, and hormonal changes. While bothersome, it is generally considered a normal, though often challenging, aspect of late pregnancy.

Choice A rationale

The critical congenital heart disease (CCHD) screening is typically performed when the newborn is between 24 and 48 hours of age, or just prior to discharge if that occurs earlier. Performing the test too early, such as between 6 and 12 hours, might yield false negative results due to the persistence of transitional circulation.

Choice B rationale

The results of the CCHD screening are typically available immediately, or within a few minutes, as it involves pulse oximetry readings. There is no waiting period of 1 to 2 weeks for the results, allowing for prompt identification and management of potential cardiac defects, preventing delays in care.

Choice C rationale

The CCHD screening specifically compares the oxygen saturation in the newborn's right hand (pre-ductal) and either foot (post-ductal). A significant difference between these two readings can indicate a shunt or obstruction within the heart or great vessels, suggesting a potential critical congenital heart defect.

Choice D rationale

Collecting a blood sample from the newborn's heel is the procedure for the newborn metabolic screening, which screens for various genetic and metabolic disorders, not the critical congenital heart disease screening. The CCHD screening is a non-invasive test performed using pulse oximetry.