Final answer:
The most suitable method for blood collection in older adults with fragile veins is using a syringe and butterfly assembly and then transferring the blood to an Evacuated Tube System (ETS) tube, which helps control the flow and reduces the chance of vein collapse.
Step-by-step explanation:
To collect a blood specimen from an older adult patient who has fragile, easy to collapse veins, the best method is typically C) Choose a syringe and butterfly assembly and transfer to ETS tube. This approach allows the healthcare provider to control the vacuum and the flow of blood, which can help prevent the collapse of fragile veins. The use of a syringe can also minimize the trauma to the vein that can occur with the 'pull' from a vacuum tube system. A butterfly needle is a small, winged needle that is ideal for patients with difficult veins. Once the blood is collected into the syringe, it can then be transferred carefully into the appropriate tubes for analysis.