A side-by-side evaluation of four platelet-counting instruments

Area of Science:

• Hematology
• Clinical Laboratory Science
• Medical Device Evaluation

Background:

• Accurate platelet counting is crucial for diagnosing and managing various hematological disorders.
• Manual platelet counting is labor-intensive and prone to variability.
• Automated hematology analyzers offer potential improvements in efficiency and precision.

Purpose of the Study:

• To evaluate and compare the performance of four different automated platelet counting instruments.
• To assess precision, linearity, and the influence of erythrocyte concentration on platelet counts.
• To analyze operational aspects including speed, ease of use, and cost.

Main Methods:

• Side-by-side comparative study of four platelet counting instruments: Haema-Count MK-4/HC, Ultra-Flo 100, Coulter Counter Model S-Plus, and AutoCounter.
• Evaluation of within-run precision, linearity across tested ranges, and sample carry-over.
• Assessment of the effect of erythrocyte concentration on platelet count accuracy for each instrument.

Main Results:

• Ultra-Flo 100 and Coulter Counter S-Plus exhibited the best within-run precision.
• All four automated instruments were significantly more precise than manual counting, particularly at low platelet levels.
• Erythrocyte concentration impacted Coulter Counter S-Plus and AutoCounter platelet counts, but not significantly the Ultra-Flo 100.

Conclusions:

• Automated platelet counters offer enhanced precision over manual methods.
• Ultra-Flo 100 provides reliable platelet counts with minimal interference from erythrocyte concentration.
• Instrument selection should consider performance, operational efficiency, and cost-effectiveness.