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Criteria for marrow engraftment: comparison of reticulocyte maturity index with conventional parameters
B I Dalal1, G R Stockford, S C Naiman
1Department of Pathology, Vancouver Hospital and Health Sciences Center, British Columbia, Canada.
Abstract:
Reticulocyte maturity index (RMI) has recently been proposed as an early indicator of marrow engraftment. We compared the RMI with conventional bone marrow engraftment criteria including total leukocyte count (WBC), absolute neutrophil count (ANC), reticulocyte count (RC) and the day of last platelet transfusion required to maintain the platelet count (PC) > or = 20 x 10(9)/l in 37 patients undergoing allo- or autologous BMT. There was no discrepancy in predicting engraftment between RMI, ANC, WBC and RC. RMI indicated engraftment earlier (median day 17, range 10-63 days) than the ANC (median day 19, range 8-63 days), WBC (median day 19, 9-71), RC (median day 19, 11-125) or PC (median day 29, 11-237). RMI heralded engraftment preceded ANC, WBC, RC or PC in 22, 21, 34 and 32 patients, respectively. RMI signal occurred 6 days prior to the rise in ANC in patients who engrafted later than 25 days (n = 7). Trend analysis showed that ANC fluctuated more frequently (6/37 patients) than RMI (1/37). Combined use of ANC and RMI (whichever increased first) predicted engraftment earlier (median 15 days) and more confidently (no false starts) than either used alone.
Insights
Reticulocyte maturity index (RMI) offers an earlier prediction of bone marrow engraftment compared to traditional markers like absolute neutrophil count (ANC). Combining RMI with ANC provides the most reliable engraftment prediction.
Area of Science:
- Hematology
- Transplantation Medicine
- Clinical Pathology
Background:
- Bone marrow engraftment is critical after hematopoietic stem cell transplantation.
- Early and accurate engraftment assessment is essential for patient management.
- Conventional markers like leukocyte and neutrophil counts have limitations in predicting engraftment timing.
Purpose of the Study:
- To compare the efficacy of Reticulocyte Maturity Index (RMI) against established engraftment criteria.
- To evaluate RMI's potential as an early indicator of marrow engraftment.
- To assess the combined predictive value of RMI and absolute neutrophil count (ANC).
Main Methods:
- Retrospective analysis of 37 patients undergoing allogeneic or autologous bone marrow transplantation (BMT).
- Comparison of RMI with total leukocyte count (WBC), ANC, reticulocyte count (RC), and platelet count (PC) thresholds.
- Analysis of engraftment timing and reliability of each parameter.
Main Results:
- RMI predicted engraftment earlier (median day 17) than ANC, WBC, RC, or PC.
- No discrepancies were found between RMI and conventional markers in predicting engraftment.
- Combined RMI and ANC use predicted engraftment earliest (median day 15) and most reliably.
Conclusions:
- RMI is a valuable early indicator of bone marrow engraftment.
- The combination of RMI and ANC enhances the accuracy and confidence of engraftment prediction.
- RMI demonstrates greater stability than ANC, reducing the incidence of false starts.