Pearls and pitfalls in factor inhibitor assays

Area of Science:

• Clinical laboratory science
• Hematology
• Hemostasis diagnostics

Background:

• Factor inhibitor assays are vital for diagnosing bleeding disorders.
• Inaccurate assay results can lead to significant patient mismanagement.
• Understanding assay limitations is key for laboratory professionals.

Purpose of the Study:

• To highlight the importance of accurate factor inhibitor assays.
• To identify common causes of false-positive and false-negative results.
• To provide safeguards for improving assay reliability.

Main Methods:

• Review of common pitfalls in factor inhibitor assay performance and interpretation.
• Emphasis on sample characterization and assay modifications (Nijmegen modification).
• Integration of incubated mixing tests and appropriate dilution strategies.

Main Results:

• False-positive and false-negative results can occur, leading to clinical errors.
• Specific procedural steps can mitigate common sources of assay inaccuracy.
• Proper technique and interpretation are essential for reliable diagnosis.

Conclusions:

• Implementing safeguards enhances the accuracy of factor inhibitor testing.
• Laboratory professionals must be vigilant in identifying and avoiding assay pitfalls.
• Accurate assays are fundamental for effective patient care in hemostasis.