Correct Answer: A

Rationale: Levonorgestrel is an emergency contraceptive that works by inhibiting ovulation to prevent conception. It is most effective when taken as soon as possible within 72 hours following unprotected sexual intercourse. Therefore, the nurse should instruct the adolescent to take the medication promptly to maximize its effectiveness. Choice B is incorrect because levonorgestrel can be used even if the individual is on oral contraceptives. Choice C is incorrect as the efficacy of levonorgestrel is not determined by the onset of menstruation. Choice D is incorrect because levonorgestrel is a single-dose emergency contraceptive and does not provide protection for 14 days after ingestion.

Correct Answer: A

Rationale: The nurse should educate clients that inadequate folic acid intake is associated with an increased risk of neural tube defects in newborns. Consuming an adequate amount of folic acid from sources like fortified cereals, oranges, artichokes, liver, broccoli, and asparagus can help prevent this serious fetal abnormality. Trisomy 21 (Choice B) is caused by an extra chromosome 21 and is not preventable by folic acid intake. Cleft lip (Choice C) and atrial septal defect (Choice D) are not directly linked to folic acid intake during pregnancy.

Correct Answer: A

Rationale: The correct answer is A. Using the client's room number as a secondary identifier is not an appropriate method for client identification in healthcare settings. It can lead to confusion and potential errors, especially in a busy environment like a postpartum unit. Room numbers are not unique to individual patients and can change frequently. Instead, healthcare providers should use more reliable and specific identifiers like the client's name, medical record number, or date of birth to ensure accurate identification and safe administration of medications. Choices B, C, and D are more appropriate secondary identifiers for client identification as they are more specific and less prone to errors than room numbers.

Correct Answer: A

Rationale: Late decelerations are indicative of uteroplacental insufficiency, which can be exacerbated by oxytocin administration, potentially compromising fetal well-being. Therefore, detecting late decelerations should prompt immediate reporting to the provider to prevent harm to the fetus. Choices B, C, and D are not contraindications for initiating oxytocin infusion. Moderate variability of the FHR is a reassuring sign of fetal well-being, cessation of uterine dilation may indicate a pause in labor progress but does not contraindicate oxytocin, and prolonged active phase of labor may necessitate oxytocin administration to augment contractions and progress labor.

Correct Answer: A

Rationale: The correct answer is A: Hypertension. Carboprost is a vasoconstrictor medication used to control postpartum hemorrhage by contracting the uterus. One of the adverse effects of carboprost is hypertension due to its vasoconstrictive properties. Hypertension can occur as a result of increased peripheral vascular resistance. Choices B, C, and D are incorrect. Hypothermia, constipation, and muscle weakness are not typically associated with the administration of carboprost. It is crucial for the nurse to monitor the client's blood pressure closely while on carboprost to promptly detect and manage hypertension.