| http://www.w3.org/ns/prov#value | - However, the blood takes longer than normal to clot in a test tube.Factor XII deficiency is a rare inherited disorder.SymptomsThere are usually no symptoms.Exams and TestsFactor XII deficiency is most often found when clotting tests are done for routine screening.Tests may include:Factor XII assayPartial thromboplastin time (PTT)Mixing studyTreatmentTreatment is usually not needed.Outlook (Prognos
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