Final answer:
To better position a patient's arm for venipuncture, a phlebotomist should adjust the bed to an angle that allows the patient's arm to be straightened and comfortable.
Step-by-step explanation:
The best means by which a phlebotomist can better position a patient's arm, which is in a slightly bent position due to the bed being at a 45-degree incline, is to adjust the bed to a more comfortable angle for the patient. This might involve either raising or lowering the bed to ensure the patient's arm can be straightened and comfortable for the venipuncture procedure to take place. Factors such as the location of the intravenous (IV) bag, the blood pressure cuff, and the general medical context need to be considered when adjusting the bed position. Doing so will ensure optimal blood flow and make it easier for the phlebotomist to properly locate the vein.