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Errors in automated reticulocyte counts due to Heinz bodies
1Section of Paediatric Haematology, University of Sheffield.
Journal of Clinical Pathology
|September 1, 1993
Summary
Heinz bodies in red blood cells can interfere with automated reticulocyte counts, leading to inaccurate results. This highlights the need for careful interpretation of automated reticulocyte counts in patients with hemolytic anemia.
Area of Science:
- Hematology
- Clinical Pathology
- Red Blood Cell Analysis
Background:
- Automated reticulocyte counting is crucial for diagnosing and monitoring hemolytic anemias.
- Heinz bodies, or denatured hemoglobin aggregates, can form in red blood cells under oxidative stress.
Observation:
- Serial reticulocyte counts were performed on a patient with unstable hemoglobin hemolytic anemia.
- The patient's red blood cells contained Heinz bodies, which were detected by automated methods.
- Automated reticulocyte counts yielded both false-low and false-high results, with alarms indicating potential issues.
Findings:
- Automated reticulocyte counting methods can be significantly affected by the presence of Heinz bodies.
- A bimodal red blood cell distribution was observed with the FACScan, reflecting Heinz body-positive and negative cell populations.
- The interference from Heinz bodies can lead to clinically significant inaccuracies in reticulocyte counts.
Implications:
- Clinicians should be aware of potential interference from Heinz bodies when interpreting automated reticulocyte counts.
- Further validation or alternative methods may be necessary for accurate reticulocyte enumeration in patients with Heinz body-positive hemolytic anemias.
- This case underscores the importance of understanding the limitations of automated hematology analyzers in complex clinical scenarios.