A nurse is reviewing the medical record of a client who has hyperthyroidism (Graves disease). Which of the following serum laboratory findings should the nurse expect to be below the expected reference range?

Choice A reason: Injecting insulin into a muscle that is going to be exercised can increase the absorption of insulin and lower the blood glucose level, leading to hypoglycemia. Therefore, it is advisable to avoid injecting insulin into the same body part that will be involved in the exercise.

Choice B reason: Carrying a complex carbohydrate snack with you when you exercise is not a good idea. Complex carbohydrates take longer to digest and raise the blood glucose level slowly. They are not suitable for treating or preventing hypoglycemia during or after exercise. A simple carbohydrate snack, such as glucose tablets, juice or candy, is more appropriate for this purpose.

Choice C reason: Exercising first thing in the morning before eating breakfast is not recommended for people with type 1 diabetes. This can cause a drop in blood glucose level and increase the risk of hypoglycemia. It is beter to have a balanced breakfast that includes some carbohydrates and adjust the insulin dose accordingly before exercising.

Choice D reason: Increasing the intensity of your exercise routine if your urine is positive for ketones is a dangerous practice. Ketones are produced when the body breaks down fat for energy due to lack of insulin or glucose. High levels of ketones can lead to diabetic ketoacidosis, a life-threatening condition that requires urgent medical atention. Intense exercise can raise the blood glucose level further and worsen the situation. If your urine is positive for ketones, you should avoid vigorous activity and check your blood glucose and ketone levels frequently.

Choice A reason: Phosphate 5.7 mg/dL is an elevated value, as the normal range is 2.5 to 4.5 mg/dL. Hypoparathyroidism causes low levels of parathyroid hormone (PTH), which regulates calcium and phosphorus balance in the body. Low PTH leads to low calcium and high phosphorus levels in the blood.

Choice B reason: Vitamin D 25 ng/mL is a normal value, as the normal range is 20 to 50 ng/mL. Hypoparathyroidism does not directly affect vitamin D levels, but vitamin D supplements may be given to help increase calcium absorption and lower phosphorus levels in the blood.

Choice C reason: Calcium 9.8 mg/dL is a normal value, as the normal range is 8.6 to 10.2 mg/dL. Hypoparathyroidism causes low levels of parathyroid hormone (PTH), which regulates calcium and phosphorus balance in the body. Low PTH leads to low calcium and high phosphorus levels in the blood. However, calcium levels may be normal or near- normal in some cases of hypoparathyroidism, especially if the condition is mild or well-controlled with treatment.

Choice D reason: Magnesium 1.8 mEq/L is a normal value, as the normal range is 1.5 to 2.5 mEq/L. Hypoparathyroidism does not directly affect magnesium levels, but magnesium deficiency can cause or worsen hypoparathyroidism, as magnesium is needed for PTH secretion and action. Magnesium supplements may be given to correct magnesium deficiency and improve PTH function.