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Papa Heme։ Causes of Isolated Prolonged aPTT Without Bleeding
May 13, 2026, 15:19

Papa Heme։ Causes of Isolated Prolonged aPTT Without Bleeding

Papa Heme, Clinical Director and Hematologist at Sarah Cannon Research Institute, shared a post on X:

”Differential diagnoses for an isolated prolonged aPTT with no bleeding

  • Lupus anticoagulant
  • Factor XII deficiency
  • High-molecular-weight kininogen deficiency
  • Prekallikrein deficiency
  • Heparin contamination

Workup

One-to-one mixing study

If the aPTT corrects, check factor levels such as factor XII deficiency

Lupus anticoagulant typically does not correct on mixing studies․՛՛

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