<prompt> Failure of clot retraction indicatesLow platelet countFactor VIII deficiencyFacto XIII deficiencyFibrinogen deficiency  <response>: Ans. a Low platelet countRef: Robbins 9thpg 657This test measures the amount of time it takes for a blood clot to pull away from the walls of a test tube Shrinking.The edges of the blood vessel wall at the point of injury are slowly brought together again to repair the damage.It is used to evaluate and manage blood platelet disorders, including Glanzmanns thrombastheniaSo Clot retraction depends primarily on the number and activity of the blood platelets 