clot retraction time


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clot re·trac·tion time

the time required for a blood clot to separate from the tube wall and express serum, usually completed in 18-24 hours, but retarded or absent in people with thrombocytopenic purpura.

clot retraction time

The time required following withdrawal of blood for a clot to completely contract and express the serum entrapped within the fibrin net. The normal time is about 1 hr. Clot retraction depends on the number of platelets in the specimen.
See also: time