A nurse is planning dietary teaching for a client who adheres to a vegan diet. The nurse should identify that the client is at greatest risk for which of the following nutrient deficiencies?

The nurse should plan to change the IV tubing for the TPN solution every 72 hours. This is necessary to maintain the sterility of the system and minimize the risk of infection. TPN solutions are prone to bacterial growth, and changing the tubing regularly helps prevent contamination.

Removing TPN from the refrigerator 5 minutes before infusing it is not necessary. TPN solutions are typically stored in the refrigerator to maintain their stability and prevent spoilage. It should be brought to room temperature over a longer period of time, usually 30-60 minutes, before administration.

Discarding the remaining TPN solution that is still infusing after 24 hours is unnecessary. TPN solutions can typically be infused for up to 24 hours without compromising their safety and efficacy. However, it is important to monitor the solution closely for any signs of contamination or degradation, and if any concerns arise, the nurse should consult with the healthcare provider.

Changing the dressing around the IV site weekly is not specific to TPN administration. Dressing changes for peripheral IV sites are typically performed according to facility protocols and the condition of the site, but they are not necessarily done on a weekly basis. The frequency of dressing changes depends on factors such as the type of dressing used, the patient's condition, and any signs of infection or dislodgement.

Coronary heart disease (CHD) is a condition characterized by the buildup of plaque in the coronary arteries, leading to reduced blood flow to the heart. Several risk factors contribute to the development of CHD, including high blood glucose levels, high levels of low-density lipoprotein (LDL) cholesterol, and high total cholesterol levels.

HbA1c 5%: HbA1c is a measure of average blood glucose levels over the past 2-3 months. A level of 5% is within the target range for individuals without diabetes and indicates good glycemic control. It does not place the client at risk for CHD.

Fasting glucose 140 mg/dL: Fasting glucose levels above 126 mg/dL are considered diagnostic criteria for diabetes mellitus. A level of 140 mg/dL indicates hyperglycemia and suggests impaired glucose metabolism, which is a risk factor for CHD.

LDL 64 mg/dL: LDL cholesterol is often referred to as "bad" cholesterol, as elevated levels are associated with an increased risk of CHD. A level of 64 mg/dL is within the desirable range and does not place the client at risk for CHD.

Total cholesterol 173 mg/dL: Total cholesterol levels below 200 mg/dL are generally considered desirable. A level of 173 mg/dL is within the desirable range and does not place the client at risk for CHD.