A nurse is caring for a client who has a major burn injury and is receiving total parenteral nutrition. Which of the following laboratory tests is the priority for the nurse to use to confirm the client is receiving adequate nutrition?

Choice A reason: Drinking orange juice with iron supplements can increase absorption, not decrease it. Orange juice is rich in vitamin C, which enhances the absorption of non-heme iron, the type of iron found in plant foods and supplements. The nurse should advise the client to take iron supplements with a source of vitamin C, such as orange juice, strawberries, or tomatoes.

Choice B reason: Cooking in a stainless steel skillet does not increase the amount of iron in the food. Stainless steel is not a good conductor of iron and does not leach iron into the food. The nurse should suggest the client to use a cast iron skillet instead, which can add iron to the food, especially acidic foods like tomatoes or citrus fruits.

Choice C reason: Drinking iced tea with meals can decrease the amount of iron absorbed, not increase it. Iced tea contains tannins, which are compounds that bind to iron and inhibit its absorption. The nurse should recommend the client to avoid drinking tea, coffee, or other beverages that contain tannins with meals, and to drink them between meals instead.

Choice D reason: Fish and poultry are primary sources of heme iron, which is the type of iron found in animal foods and is more easily absorbed by the body. The nurse should encourage the client to eat more foods that are high in heme iron, such as fish, poultry, meat, and eggs.

Choice A reason: Measuring the client's gastric residual every 12 hr is not frequent enough to monitor the feeding tolerance and prevent aspiration. The nurse should measure the gastric residual before each intermittent feeding or every 4 to 6 hr during continuous feeding¹².

Choice B reason: Flushing the client's tube with 30 mL of water every 4 hr is an appropriate action to maintain the tube patency, prevent clogging, and hydrate the client. The nurse should flush the tube before and after each medication administration, feeding, or gastric residual check¹³.

Choice C reason: Keeping the client's head elevated at 15° during feedings is not sufficient to prevent reflux and aspiration. The nurse should elevate the head of the bed at least 30° to 45° during feedings and for at least 30 min to 1 hr after feedings¹⁴.

Choice D reason: Obtaining the client's electrolyte levels every 4 hr is not necessary unless the client has signs of fluid or electrolyte imbalance, such as edema, dehydration, or abnormal vital signs. The nurse should monitor the client's weight, intake and output, and laboratory values as ordered by the provider¹⁵.