What blood draw method uses a straight needle or a butterfly needle attached directly to the hub?

The evacuated tube method (also called the Vacutainer system) uses a straight needle or a butterfly needle attached directly to a plastic hub or holder, into which pre-evacuated collection tubes are inserted. The vacuum inside the tube draws blood directly from the vein into the tube without a syringe plunger being pulled. This is the most commonly used blood collection system in clinical settings because it is efficient, minimizes contamination risk, and allows multiple tubes to be collected in sequence. The standard syringe method uses a syringe with a plunger that the phlebotomist manually withdraws to create suction; it does not use a straight needle attached directly to a hub without a syringe barrel. The evacuated syringe is not a standard recognized method in phlebotomy terminology. A 'stubborn tube' is not a recognized phlebotomy technique at all. The butterfly needle can be used with either the evacuated tube system or a syringe, but when it is attached to a hub without a syringe, it specifically describes the evacuated tube setup. Recognizing the correct equipment and techniques prevents hemolysis, contamination, and patient discomfort during venipuncture.