Correct Answer: B

Rationale: A platelet count of 9800/mm³ indicates severe thrombocytopenia, placing the client at high risk for bleeding, even with minor trauma or injury. Instructing the client to call for help before getting out of bed ensures they receive assistance with mobility, which reduces the risk of falls or injuries that could lead to serious bleeding. Preventing any activity that could result in trauma is crucial when managing clients with very low platelet counts.

Correct Answer: B

Rationale: Tamoxifen is a selective estrogen receptor modulator (SERM) that has been shown to significantly reduce the risk of developing breast cancer in women who are at high risk, particularly those with a family history of the disease or a positive genetic test for BRCA mutations. Large-scale studies have demonstrated that tamoxifen can reduce the incidence of breast cancer by up to 50% in high-risk women. It works by blocking estrogen receptors in breast tissue, which helps prevent the development of estrogen receptor-positive breast cancers.

Correct Answer: B

Rationale: In polycythemia vera, there is an overproduction of red blood cells, white blood cells, and platelets, which leads to increased blood viscosity and a high risk for thrombosis (blood clot formation). Monitoring the platelet count is a priority because elevated platelet levels contribute significantly to the risk of developing blood clots, which can result in life-threatening complications such as strokes, heart attacks, or deep vein thrombosis (DVT). Therefore, regular monitoring of the platelet count is essential to assess the patient's risk for thrombosis and to guide treatment decisions, such as phlebotomy or medication adjustments to lower platelet levels.

Correct Answer: A

Rationale: Epoetin alfa is a medication used to treat anemia, particularly anemia related to chemotherapy or chronic kidney disease. It stimulates the bone marrow to produce more red blood cells, which increases the hemoglobin level. Monitoring hemoglobin is the best way to assess the effectiveness of epoetin alfa, as an increase in hemoglobin indicates that the body is producing more red blood cells and the anemia is improving.

Correct Answer: B

Rationale: Clients with internal radiation implants (also known as brachytherapy) emit a small amount of radiation, which can pose a risk to others. Pregnant women are particularly vulnerable to the harmful effects of radiation because it can affect both the mother and the developing fetus. Radiation exposure can lead to birth defects, miscarriage, or other developmental issues, so pregnant women should avoid any exposure by not entering the client's room.