PT/PTT Mixing Study Reflex Testing / gyg
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PT/PTT Mixing Study Reflex Testing / gyg
Department of Pathology and Laboratory Medicine IU Health Pathology Laboratory Indianapolis, IN 46202 PT/PTT Mixing / g Studyy Reflex Testing g Before proceeding, rule out heparin with TCT Prolonged PT Normal PTT PT=13.0-14.9s VII Only (no mix) Low VII Stop Normal VII FII, V, X Normal PT Prolonged PTT PT>14.9s PTT=38.1-41.0s Mix (no incubation) + VII Stop Normal VII FII, V, X DRVVT/SCT only (no mix) FVIII, IX, XI XI, XII Factor XII Stop Incubated mix Fibrinogen Mix with incubation No Correction Normal DRVVT/SCT Low XII Prolonged PT Prolonged PTT Rule out heparin PTT>41.0s Corrects Low VII Normal PT/PTT Prolonged TCT Normal XII Clinical Presentation DRVVT/SCT Normal Low Lo Stop Fibrinogen Antigen Specific Factor Inhibitor FVIII, IX, XI Corrects Factors II, V, X Any Low Stop Normal II,, V,, X Fibrinogen Normal Stop Low Fibrinogen Antigen