What is the typical administration time for Combination Insulins such as NPH 70%/Human Regular 30%?

Combination insulins like NPH 70%/Human Regular 30% are designed to provide both immediate and intermediate actions in controlling blood sugar levels. The correct administration time is 15-30 minutes before meals, especially breakfast and supper. This timing allows the rapid-acting component of the insulin (Human Regular) to begin working effectively to manage blood glucose levels as food intake starts, while the longer-acting component (NPH) begins to cover blood sugar levels over several hours.

By administering the insulin within this time frame, it optimally prepares the body to manage the post-meal glucose spike, which is crucial for maintaining healthy blood sugar levels. The other options suggest timing that does not align with the intended effect of the combination insulin in controlling blood glucose levels surrounding meal times.