The nurse is reviewing the past medical history of a group of clients. Which client would the nurse suspect as having folic acid deficiency? The:

Choice A reason: I will call dietary to bring you breakfast is not the best response by the nurse. This response may imply that the nurse is willing to compromise the test results or the client's safety by allowing them to eat before the test. The nurse should explain the rationale for fasting and offer the client some water or ice chips if allowed.

Choice B reason: Food may interact with the dye that is used for the test is not the best response by the nurse. This response may be partially true, but it is not specific or clear enough to justify the need for fasting. The nurse should explain that food can affect the absorption and distribution of the radioactive tracer that is injected into the bloodstream for the test, and that eating can also interfere with the quality of the images.

Choice C reason: I will ask the health care provider if the test can be rescheduled is not the best response by the nurse. This response may suggest that the nurse is not confident or knowledgeable about the test protocol or the client's condition. The nurse should explain the importance and urgency of the test and reassure the client that they will be able to eat after the test is done.

Choice D reason: The procedure is usually completed on an empty stomach is the best response by the nurse. This response is accurate and concise, and it informs the client of the standard preparation for the test. The nurse should also provide more details about the test procedure and the expected duration, and answer any questions or concerns that the client may have.

Choice A: Elevated troponins. This is a correct answer. Troponins are proteins that regulate the myocardial contractile process². They are released into the bloodstream when the myocardial cells are damaged by ischemia or infarction². Troponins are highly specific and sensitive indicators of myocardial injury². The normal range for troponin I is less than 0.03 ng/mL and for troponin T is less than 0.01 ng/mL².

Choice B: Decreased homocysteine levels. This is not a correct answer. Homocysteine is an amino acid that is involved in the metabolism of methionine². Elevated homocysteine levels are associated with an increased risk of cardiovascular disease, but they are not a direct marker of myocardial injury². The normal range for homocysteine is 5 to 15 micromol/L².

Choice C: Elevated CK-MB. This is a correct answer. CK-MB is one of the isoenzymes of creatine kinase, an enzyme that catalyzes the conversion of creatine to phosphocreatine, which is used for energy storage in the muscles². CK-MB is found mainly in the myocardium and is released into the blood when the myocardial cells are injured². CK-MB is a specific and sensitive marker of myocardial injury, but it is less specific than troponins². The normal range for CK-MB is 0 to 3 ng/mL².

Choice D: Decreased alkaline phosphatase (ALP).This is not a correct answer. ALP is an enzyme that is found in various tissues, such as the liver, bone, intestine, and placenta². ALP is not a marker of myocardial injury, and its levels are not affected by ischemia or infarction². The normal range for ALP is 30 to 120 U/L².

Choice E: Increased platelet count.This is not a correct answer. Platelets are blood cells that are involved in hemostasis and clot formation². Increased platelet count, or thrombocytosis, can be a sign of inflammation, infection, malignancy, or other conditions². Platelet count is not a marker of myocardial injury, and it does not reflect the extent of ischemia or infarction². The normal range for platelet count is 150,000 to 450,000 per microliter of blood².