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Fingerstick blood samples in platelet donor screening: reliability and impact on predict yield programs
M J Randels1, R G Strauss, T J Raife
1College of Medicine, University of Iowa, Iowa City, USA.
This study examined whether fingerstick blood samples can reliably determine platelet counts for donor eligibility and yield predictions in plateletpheresis. Researchers found that fingerstick counts are consistently lower than venous samples and show poor correlation. Despite this, fingerstick data did not lead to frequent donor disqualification. When used for yield predictions, fingerstick-based collections produced slightly higher yields than venous-based ones. However, the variability in yields was similar between the two methods. The study also found that fingerstick-based collections did not improve yield consistency compared to standard volume collections. These findings suggest that venous samples remain more accurate for platelet count assessments and yield predictions in plateletpheresis.
Area of Science:
- Bleeding disorders and transfusion medicine
- Medical device validation in hematology
- Plateletpheresis and donor screening protocols
Background:
Current donor screening practices often rely on fingerstick blood samples to assess platelet counts. However, the accuracy of these samples in predicting platelet yield during apheresis remains unclear. Prior research has shown that venous blood samples provide more reliable data for platelet counts. This paper investigates whether fingerstick samples can be used effectively in plateletpheresis programs. The study addresses a gap in understanding how fingerstick-derived platelet counts compare with venous samples in terms of accuracy and yield consistency. No prior work had resolved whether fingerstick counts reliably predict platelet yield outcomes. This research aims to clarify the reliability of fingerstick platelet counts in donor screening. The findings may influence current protocols for plateletpheresis and donor eligibility assessments. The study focuses on whether fingerstick data can be used without compromising yield consistency.
Purpose Of The Study:
The study aimed to evaluate the reliability of fingerstick platelet counts compared to venous samples in determining donor eligibility and predicting platelet yield during apheresis. The specific problem addressed is whether fingerstick counts can be used confidently in plateletpheresis programs. The motivation stems from the widespread use of fingerstick samples despite limited evidence of their accuracy. The research sought to determine if fingerstick-derived counts correlate well with venous samples. The study also aimed to assess how fingerstick data affects yield predictions in apheresis instruments. The goal was to compare yield variability between fingerstick and venous sample-based predictions. The findings could inform whether fingerstick samples are suitable for use in plateletpheresis protocols. The results may help refine donor screening practices and improve yield consistency.
Main Methods:
The study compared platelet counts from fingerstick and venous samples in apheresis procedures. Researchers analyzed 25 paired samples to assess correlation and mean differences. They used statistical methods to evaluate the reliability of fingerstick counts. The study also examined the impact of fingerstick data on apheresis yield calculations. Two apheresis instruments were used: Fenwal CS3000 PLUS and Haemonetics MCS+. Platelet yields were compared between fingerstick and venous sample-based predictions. Coefficients of variation (CV) were calculated to assess yield consistency. A retrospective analysis compared fingerstick and standard volume collections for yield variability.
Main Results:
Fingerstick platelet counts showed a poor correlation with venous counts (r2 = 0.43). Mean fingerstick counts were 20% lower than venous counts (P < 0.05). Platelet yields using fingerstick/predict yield were 12% and 15% higher than venous/predict yield for the CS3000 and MCS+ instruments, respectively. Coefficients of variation (CV) were similar between fingerstick and venous sample-based collections. For CS3000, CVs were 15% vs. 14%, and for MCS+, 23% vs. 21%. Retrospective analysis showed no significant difference in yield consistency between fingerstick and standard volume collections. Fingerstick-based yields had a CV of 22% vs. 20% for CS3000 and 22% vs. 24% for MCS+. These results suggest that fingerstick data does not improve yield consistency compared to standard volume collections.
Conclusions:
The authors concluded that fingerstick platelet counts are systematically lower and poorly correlated with venous counts. They also found that fingerstick data does not lead to frequent false disqualification of donors. The study suggests that fingerstick counts may not be reliable for determining donor eligibility. The authors propose that fingerstick-based yield predictions do not improve consistency compared to standard volume collections. They emphasize that the use of fingerstick samples does not enhance yield variability. The findings indicate that venous samples remain more accurate for platelet count assessments. The authors suggest that current protocols should consider the limitations of fingerstick data. Their results support the need for continued reliance on venous samples for accurate yield predictions.
Frequently Asked Questions
Fingerstick counts are 20% lower on average and show poor correlation (r2 = 0.43) with venous counts.
Fingerstick/predict yield collections produced 12% and 15% higher yields than venous/predict yield for CS3000 and MCS+ instruments.
No, coefficients of variation (CV) for fingerstick and venous samples were comparable, indicating similar yield variability.
The study used Fenwal CS3000 PLUS and Haemonetics MCS+ apheresis instruments to compare yield outcomes.
Fingerstick-based collections showed no significant difference in yield consistency compared to standard volume collections.
The authors suggest fingerstick counts are systematically lower and poorly correlated with venous counts, but do not lead to frequent donor disqualification.