Final answer:
In healthy medium to large pet birds, the right jugular vein is the best choice for blood collection due to its larger size and ease of accessibility.
Step-by-step explanation:
The best vein to use for blood collection in healthy medium to large pet birds is the right jugular vein. The right jugular vein has a larger lumen compared to the left in most bird species, making it more accessible for venipuncture. Additionally, this vein allows for the collection of larger blood samples when necessary, which may be required for various diagnostic tests.
The basilic vein is not typically used in birds as it is less accessible and offers a smaller volume for blood draw. The medial metatarsal vein could be used but is more commonly utilized in smaller birds or for smaller blood samples. The right jugular vein provides a balance of accessibility and safety for both the bird and the veterinary professional performing the procedure.