**Question:** According to CDC recommendations, HIV screening of pregnant women is

A. before conception
B. at the first prenatal visit
C. at the first prenatal visit and at the postpartum visit
D. at the first prenatal visit and at the postpartum visit

**Core Concept:** HIV (Human Immunodeficiency Virus) screening in pregnant women is an essential public health measure to prevent mother-to-child transmission and ensure proper management of infected patients. The Centers for Disease Control and Prevention (CDC) provides guidelines for the optimal timing and frequency of HIV screening in pregnant women.

**Why the Correct Answer is Right:** The CDC recommends HIV screening of pregnant women at the first prenatal visit (D) and also at the postpartum visit. This comprehensive approach ensures early detection of HIV infection in pregnant women, allowing for appropriate counseling, antiretroviral therapy, and postpartum prophylaxis to reduce the risk of mother-to-child transmission.

**Why Each Wrong Option is Incorrect:**

A. Screening before conception is not the sole time for HIV testing in pregnant women. The first prenatal visit is crucial for detecting HIV infection in pregnant individuals who may not have sought prenatal care before becoming pregnant.

B. Although the first prenatal visit is essential, the postpartum visit is also vital to check for late-onset HIV infection and monitor the effectiveness of prophylactic interventions in preventing mother-to-child transmission.

C. This option combines the correct answers A and B but does not include the postpartum visit, which is crucial for comprehensive HIV screening and management.

**Why the Correct Answer is Right:**

HIV screening in pregnant women is crucial for preventing mother-to-child transmission and ensuring appropriate management of infected patients. By screening at both the first prenatal visit and postpartum visit, healthcare professionals can detect HIV infections at an early stage, provide appropriate counseling, initiate antiretroviral therapy, and ensure postpartum prophylaxis to reduce the risk of mother-to-child transmission.

**Why Each Wrong Option is Incorrect:**

A. Screening before conception is essential, but the first prenatal visit is also crucial for detecting HIV infection in pregnant individuals who may not have sought prenatal care before becoming pregnant.

B. Although the first prenatal visit is important, the postpartum visit is vital to check for late-onset HIV infection and monitor the effectiveness of prophylactic interventions to prevent mother-to-child transmission.

C. Combining options A and B does not fully address the need for comprehensive HIV screening and management. Screening at both the first prenatal visit and postpartum visit ensures early detection of HIV infections, appropriate counseling, initiation of antiretroviral therapy, and postpartum prophylaxis to minimize the risk of mother-to-child transmission.