Principle of the Test The Kaolin Clotting Time (PTTK), an activated partial thromboplastin time test which uses kaolin as the activator, was first described in 1958. The Kaolin Clotting Time formulated without any added phospholipid (KCT) was first used to study lupus anticoagulants in 1978, and has been reported to be the most sensitive test for the detection of circulating anticoagulants such as Lupus anticoagulants. In the absence of added phospholipid the assay only poorly accelerates the clotting cascade and is sensitive to coagulopathies in the contact and common pathways. The KCT is performed as would an APTT. One volume of patient sample is mixed with one volume of the KCT reagent, the mixture incubated for 3 to 5 minutes, and the reaction initiated with the addition of one volume of 25 mM calcium chloride. An abnormal KCT time is only generally indicative of a defect in coagulability of the neat sample. Mixing tests are recommended for use with the LupoTek KCT reagent in order to distinguish between factor deficiencies and antibody related inhibitors in samples testing outside the normal range. We recommend the 1:1 mix of patient plasma and normal pooled plasma for most testing purposes. Reporting Units In the United States the KCT of neat patient sample and mixes of patient sample and NPP may be expressed as the raw clotting time in seconds. A “Rosner Index”, a method of normalizing the results of the KCT, is often used in Europe and Australia but is not currently cleared

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