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[Reticulated platelet determination: methodologies and applications for the evaluation of thrombocytopenic disorders]
Abstract:
Reticulated platelets retain some residual mRNA in their cytoplasm and are thought to be newly produced platelets. In recent years, it has been reported that the reticulated platelet count (RP) correlates well with platelet production. For that reason, the measurement of RP (%) is considered useful for analyses of platelet kinetics and differential diagnoses of thrombocytopenic disorders. However, certain technical difficulties exist because fluorochrome thiazole orange (TO), which is used for staining purposes, stains platelet granules nonspecifically, and so far, only a few reports have documented the study of precision staining techniques. We evaluated staining criteria precisely in an effort to solve the issue of nonspecific staining by TO, and concluded that the important points for effective staining were (1) fixation of platelets, (2) 1:8 dilution of TO (ReticCount), (3) incubation for 1 to 2 hours, and (4) the capture of platelets using anti-CD42b monoclonal antibody. We stained reticulated platelet samples by the above method and achieved intra-assay reproducibility of 3.4-5.1% RP (%) in normal subjects was 8.7 +/- 2.2%. It was significantly higher (23.6 +/- 13.3%) in patients with idiopathic thrombocytopenic purpura (ITP), and elevated in 87% of all evaluated ITP patients. Our method is sensitive, provides reproducible results, and can be effectively utilized for the analysis of platelet kinetics and differential diagnosis of thrombocytopenia.
Insights
Reticulated platelet count (RP) measurement aids platelet production analysis. A refined staining method using thiazole orange (TO) and anti-CD42b antibody improves accuracy for diagnosing thrombocytopenic disorders.
Area of Science:
- Hematology
- Clinical Pathology
- Flow Cytometry
Background:
- Reticulated platelets, containing residual mRNA, reflect recent platelet production.
- Reticulated platelet count (RP) is valuable for assessing platelet kinetics and diagnosing thrombocytopenic disorders.
- Current methods using thiazole orange (TO) for RP staining face challenges due to nonspecific staining of platelet granules.
Purpose of the Study:
- To optimize staining criteria for reticulated platelets to overcome nonspecific staining issues with thiazole orange (TO).
- To establish a precise and reproducible method for measuring reticulated platelet count (RP).
Main Methods:
- Platelet fixation was employed.
- Thiazole orange (TO) was used at a 1:8 dilution (ReticCount).
- Incubation was performed for 1-2 hours, and platelets were captured using anti-CD42b monoclonal antibody.
Main Results:
- The optimized method achieved intra-assay reproducibility of 3.4-5.1% for RP.
- Normal subjects showed an RP of 8.7 +/- 2.2%.
- Idiopathic thrombocytopenic purpura (ITP) patients exhibited a significantly higher RP (23.6 +/- 13.3%), with 87% showing elevated levels.
Conclusions:
- The developed staining protocol provides sensitive and reproducible results for reticulated platelet count (RP) measurement.
- This method is effective for analyzing platelet kinetics and aiding in the differential diagnosis of thrombocytopenia, particularly ITP.