A nurse is providing teaching about blood pressure measurement to a client who has hypertension. Which of the following instructions should the nurse include?

Choice A reason: Potassium 3.5 mEq/L is not a finding that indicates fluid volume deficit because it is within the normal range, which is 3.5 to 5.0 mEq/L. Potassium is an electrolyte that regulates nerve and muscle function, acid-base balance, and fluid balance. Potassium level can be affected by various factors, such as diet, medication, kidney function, and dehydration.

Choice B reason: Sodium 145 mEq/L is not a finding that indicates fluid volume deficit because it is within the normal range, which is 136 to 145 mEq/L. Sodium is an electrolyte that regulates blood pressure, blood volume, and fluid balance. Sodium level can be affected by various factors, such as diet, medication, kidney function, and fluid loss.

Choice C reason: Hematocrit 53% is a finding that indicates fluid volume deficit because it is above the normal range, which is 38 to 50% for men and 34 to 46% for women. Hematocrit is the percentage of red blood cells in the total blood volume. Hematocrit level can increase due to dehydration, which causes hemoconcentration or increased blood viscosity.

Choice D reason: HbA1c 5% is not a finding that indicates fluid volume deficit because it is within the normal range, which is less than 5.7%. HbA1c is the percentage of hemoglobin that is attached to glucose. HbA1c level reflects the average blood glucose level over the past two to three months. HbA1c level can be affected by various factors, such as diabetes, anemia, and medication.

Choice A reason: Increasing vitamin C intake while taking this medication is not necessary, as vitamin C does not interact with tetracycline. Vitamin C is important for immune function, wound healing, and collagen synthesis.

Choice B reason: Eliminating raw fruits and vegetables until 2 weeks after completing this medication is not required, as raw fruits and vegetables do not interfere with tetracycline. Raw fruits and vegetables are good sources of fiber, vitamins, minerals, and antioxidants.

Choice C reason: Taking a folic acid supplement while on this medication is not advised, as folic acid can reduce the absorption and effectiveness of tetracycline. Folic acid is essential for DNA synthesis, cell division, and red blood cell production.

Choice D reason: Avoiding taking this medication with milk products is important, as milk products contain calcium, which can bind to tetracycline and form insoluble complexes that decrease its absorption and activity. Milk products also increase the risk of gastrointestinal side effects such as nausea, vomiting, and diarrhea.