Blood collection devices containing blood stabilization agent including variegin or analog thereof and/or a polysulfated disaccharide

A device for collecting and stabilizing platelet function in a collected blood sample, wherein the device has a first end and a second end and at least one interior wall defining a reservoir portion for receiving the blood sample, wherein the reservoir comprises an anti-coagulant and a platelet stabilization agent comprising variegin having an amino acid sequence designated as SEQ ID NO:

• 1, or a fragment thereof, wherein the fragment is selected from the group consisting of SEQ ID NOS:
• 2-5 and analogs of such fragments, the analog fragments selected from the group consisting of SEQ ID NOS:
• 6-16, either alone or in combination with a polysulfated disaccharide each in an amount effective to stabilize platelets in the blood collected by the device for at least about twenty-four hours, wherein the device is sterile, at least partially evacuated and which further comprises a closure pierceable by a needle.