How do you obtain clotted clotted blood?

Clotted blood can be obtained by allowing fresh blood to sit undisturbed at room temperature or in a warm environment, which promotes coagulation. The blood will naturally clot as platelets and proteins like fibrinogen work to form a gel-like matrix. Once clotting occurs, the liquid portion (serum) can be separated from the solid clot by centrifugation or simply by careful decantation. Always ensure to follow appropriate safety and ethical guidelines when handling blood samples.