A woman visits a health center requesting oral contraceptives. Which laboratory test is most important for the nurse to assess before the patient begins oral contraceptive therapy?

Choice A reason: Rotating the injection sites within the same location for a week is not correct. The client should rotate the injection sites within the same location each day to prevent lipodystrophy and ensure consistent absorption.

Choice B reason: Storing the unopened vials of insulin in the freezer is not correct. The client should store the unopened vials of insulin in the refrigerator, not the freezer, to prevent damage to the insulin.

Choice C reason: Drawing up the regular insulin before the NPH insulin is correct. The client should draw up the clear (regular) insulin before the cloudy (NPH) insulin to prevent contamination of the regular insulin with the NPH insulin.

Choice D reason: Injecting the insulin into the muscle for faster absorption is not correct. The client should inject the insulin into the subcutaneous tissue, not the muscle, to ensure appropriate absorption and prevent hypoglycemia.

Choice A reason: This is incorrect because the nurse should inject air into the NPH insulin vial after injecting air into the regular insulin vial. This prevents contamination of the regular insulin with the NPH insulin.

Choice B reason: This is correct because the nurse should inject air into the regular insulin vial first, then into the NPH insulin vial, before withdrawing the regular insulin. This equalizes the pressure in the vials and facilitates the withdrawal of the insulin.

Choice C reason: This is incorrect because the nurse should not replace the needle for withdrawal with a safety needle. The same needle should be used for injecting air and withdrawing insulin from both vials.

Choice D reason: This is incorrect because the nurse should withdraw 10 units of insulin from the regular insulin vial after injecting air into both vials. This prevents mixing of the NPH insulin with the regular insulin in the vial.