Paroxysmal nocturnal haemoglobinuria: diagnostic tests, advantages, & limitations

Area of Science:

• Hematology
• Genetics
• Immunology

Background:

• Paroxysmal nocturnal haemoglobinuria (PNH) is a rare acquired clonal disorder of haematopoietic stem cells.
• The molecular defect involves the PIGA gene, leading to deficient glycosylphosphatidylinositol (GPI)-anchored proteins on cell membranes.
• Clinical PNH subtypes include classic, PNH with other bone marrow disorders, and subclinical PNH, differing in clone size.

Purpose of the Study:

• To review diagnostic methods for PNH clone detection.
• To highlight recent advances and recommendations for flowcytometric diagnosis of PNH.
• To emphasize the importance of sensitive tests for diagnosing and monitoring PNH patients.

Main Methods:

• Review of diagnostic techniques for PNH.
• Focus on flow cytometry as the gold standard.
• Discussion of complement-based tests used before 1990.

Main Results:

• Flow cytometry has become the gold standard for PNH diagnosis.
• Flow cytometry offers increased sensitivity for detecting small clones.
• Flow cytometry enables accurate measurement of PNH clone size and is unaffected by blood transfusions.

Conclusions:

• Flow cytometry is the preferred method for PNH diagnosis and clone size monitoring.
• Advances in flow cytometry have revolutionized PNH management.
• Sensitive and accurate diagnostic tools are crucial for effective PNH patient care.