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aPTT (Activated Partial Thromboplastin Time)

This Medical Laboratory Science lesson in Hematology supports laboratory science learning and laboratory interpretation for medical laboratory students and professionals.

Activated partial thromboplastin time, intrinsic/common pathway screening, heparin monitoring context, reagent sensitivity variation.

Intermediate30 min read21 sectionsHematology
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Learning Objectives

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Section 1 of 21

Learning Objectives

Learning Objectives

Section: Learning Objectives

Coagulation assays are screening tools, interpret with specimen quality, reagent context, and institutional reference intervals.

  • Describe aPTT assay principle (contact activation + phospholipid/calcium)
  • List pathway factors: XII, XI, IX, VIII, X, V, II, fibrinogen
  • Recognize heparin, hemophilia, lupus anticoagulant associations, pattern support only
  • Apply institutional reference interval and reagent sensitivity limits

Section 1 of 21