What type of blood collection results from using green heparin tubes?

The correct response is plasma, which is obtained from blood collected in green heparin tubes. Heparin is an anticoagulant that prevents blood from clotting by inhibiting thrombin and factor Xa, allowing the sample to remain in a liquid state. This means that when blood in a heparin tube is centrifuged, the resultant supernatant is plasma, which contains water, electrolytes, enzymes, and other proteins without any clotting factors that would be present in serum.

The other choices are not applicable in this scenario because whole blood comprises all components of blood, including cells, and is not separated. Serum is obtained from clotted blood, which is not the case with heparin tubes as they prevent clotting. Clotted blood refers to samples collected in tubes that allow clot formation, which would yield serum instead of plasma. Therefore, the use of green heparin tubes specifically results in plasma collection.