Final answer:
The correct option is that only regular insulin should be used for preparing an IV solution since other types cannot be given intravenously. Regular insulin decreases blood glucose levels after high-glucose meals.
Step-by-step explanation:
When preparing an IV solution with insulin, it's important to know the correct procedure and which type of insulin is suitable for intravenous administration. The correct statement among the given options is: 1) You should use only regular insulin. The other types of insulin cannot be given IV. It is essential to use regular insulin because it is the only formulation that can be administered intravenously. Other insulin types like NPH or long-acting insulins are designed for subcutaneous injection and have different onsets of action that are not suitable for IV use.
Regular insulin's primary purpose when used intravenously is to decrease blood glucose levels after a person consumes a meal high in glucose. This is opposed to the incorrect statement that insulin injections are used to increase blood glucose levels before eating.