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Ziad Omar: PTT and aPTT Testing – Reading the Intristic Pathway of Coagulation
Ziad Omar/LinkedIn
May 26, 2026, 11:34

Ziad Omar: PTT and aPTT Testing – Reading the Intristic Pathway of Coagulation

Ziad Omar, Medical Laboratory Technician at Palestine Red Crescent Society, shared a post on LinkedIn:

“PTT / aPTT is one of the most important screening tests in coagulation, but its interpretation requires more than reading a number.

In this LabCore Education series, we explored the practical and scientific foundation of PTT / aPTT testing:

  • Intrinsic and common pathway assessment
  • Citrated plasma sample requirements
  • 9:1 blood-to-citrate ratio
  • Causes of prolonged PTT / aPTT
  • Mixing study interpretation
  • Practical mixing technique
  • Inhibitors and lupus anticoagulant concepts
  • Unfractionated heparin monitoring
  • Pre-analytical errors
  • PT vs PTT / aPTT comparison

The key takeaway:

A prolonged PTT / aPTT should always be interpreted in context — considering sample quality, medications, clinical history, and the need for further testing.

This series is designed for medical laboratory professionals, students, and healthcare workers who want a clear, practical approach to coagulation testing.”

Ziad Omar

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