A woman visits a health center requesting oral contraceptives. Which laboratory test is most important for the nurse to assess before the patient begins oral contraceptive therapy?

Choice A reason: This is incorrect because constipation is not a common or serious adverse effect of antihistamines. However, the patient should increase their fluid and fiber intake and exercise regularly to prevent constipation.

Choice B reason: This is incorrect because abdominal cramps are not a common or serious adverse effect of antihistamines. However, the patient should avoid spicy or fatty foods and take the antihistamine with food or milk to prevent stomach irritation.

Choice C reason: This is correct because drowsiness is one of the most common and bothersome adverse effects of antihistamines. The patient should avoid driving or operating machinery if they experience drowsiness and take the antihistamine at bedtime.

Choice D reason: This is incorrect because decreased libido is not a common or serious adverse effect of antihistamines. However, the patient should inform their provider if they experience any sexual dysfunction or mood changes while taking the antihistamine.

Choice A reason: Venous thromboembolism is a contraindication for taking SERMs. SERMs are drugs that act like estrogen in some tissues and block estrogen in others. They can help prevent bone loss and fractures in postmenopausal women, but they can also increase the risk of blood clots in the veins, such as deep vein thrombosis and pulmonary embolism. Therefore, women who have a history of or are at high risk for venous thromboembolism should not take SERMs.

Choice B reason: Breast cancer is not a contraindication for taking SERMs. In fact, some SERMs, such as tamoxifen and raloxifene, are used to treat or prevent breast cancer in women who have estrogen receptor-positive tumors. These SERMs block the effects of estrogen in the breast tissue and reduce the growth of cancer cells.

Choice C reason: Hypocalcemia is not a contraindication for taking SERMs. Hypocalcemia is a low level of calcium in the blood. SERMs do not affect calcium levels directly, but they can help prevent calcium loss from the bones by mimicking the effects of estrogen in the bone tissue. However, women who take SERMs should also take adequate calcium and vitamin D supplements to maintain bone health.

Choice D reason: Stress fractures are not a contraindication for taking SERMs. Stress fractures are small cracks in the bones that result from repeated stress or overuse. SERMs can help prevent stress fractures by strengthening the bones and reducing the risk of osteoporosis. However, women who take SERMs should also avoid excessive or inappropriate physical activity that can cause stress fractures.