Which position involves raising the head of the bed 30 degrees, and optionally the knee portion by an additional 15 degrees?

The Semi-Fowler position is characterized by having the head of the bed elevated to about 30 degrees, which can help facilitate patient comfort and respiratory function. In this position, the torso is supported at an angle, which can be beneficial for patients who need assistance with breathing or have conditions such as gastroesophageal reflux. Additionally, raising the knee portion by an extra 15 degrees can provide further support and comfort for the legs and lower back, enhancing overall patient positioning.

In contrast, the Fowler position typically involves a higher degree of elevation, usually between 45 to 90 degrees, making it more appropriate for patients who require a more upright posture. The supine position has the patient lying flat on their back and does not involve any elevation. The sitting position can vary widely, but it generally doesn't refer specifically to the elevated angle of the bed, as seen in the Semi-Fowler position. Thus, the Semi-Fowler position aligns perfectly with the specific requirements outlined in the question.