Blood cannot clot so quickly that it actually prevents a successful blood draw. If that were the case, you entire vascular system would be one giant clot. The only reason that a phlebotomist is unable to get a persons' blood is their (the phlebotomists') inability to draw the blood.
Sodium citrate is an anticoagulant that is added to blood collection tubes to prevent the blood from clotting. It works by binding to calcium ions in the blood, which are necessary for the clotting process, and thereby inhibiting blood clot formation during sample collection and processing.
Blood clotting, or coagulation, is the body's natural reaction. If it didn't clot, you could possibly keep on bleeding until you bled to death. This helps to prevent that from happening. In humans, coagulation usually involves a cellular platelet and a protein factor . The platelets forms a sort of "plug" over the opening, like the prick of the needle from drawing blood. The protein factors then reinforce this "plug" of sorts to help keep it solid until the opening heals, scabs over, closes, ect.
Disseminated Intravascular Coagulation
Platelets help with blood clotting
The chief plasma component to the clotting of blood is the platelet. The additional components include blood clotting factors.
The lavender top tube used for drawing a complete blood count (CBC) is called an EDTA tube. It contains the anticoagulant ethylenediaminetetraacetic acid (EDTA) to prevent blood clotting and preserve the integrity of the blood sample for analysis.
Red blood cells do not initiate clotting. Platelets initiate clotting.
Hemophilia
Plasma is the liquid component of blood. It does not cause the clotting. The part of blood that causes clotting are the platelets.
Platelets are important for blood clotting. Along with these platelets there are various blood clotting factors which helps to clot the blood.
hemopholia is caused by a mutation of ones of the genes thatproduces blood-clotting proteins.
Vitamin K is responsible for blood clotting. Or is it responsible for clotting blood? Whatever way you want to say it, it's vitamin K. :)