Basophil counts on the technicon H*1 automated counter

Area of Science:

• Hematology
• Clinical Pathology
• Medical Laboratory Science

Background:

• Automated blood cell counters are essential for routine hematological analysis.
• Accurate basophil counting is clinically relevant but challenging with manual methods.
• The Technicon H*1 instrument utilizes specific technology for basophil enumeration.

Purpose of the Study:

• To evaluate the precision, accuracy, stability, and clinical utility of the Technicon H*1 basophil count.
• To establish a reference range for absolute basophil counts using this automated system.
• To assess the reliability of automated basophil counts in identifying true basophilia versus pseudo-basophilia.

Main Methods:

• Assessed precision and accuracy of the Technicon H*1 basophil count against established criteria.
• Determined the stability of basophil counts at room temperature and 4 degrees C over 3 days.
• Derived a reference range for absolute basophil counts.
• Compared automated counts with manual microscopic examination to identify discrepancies.

Main Results:

• Precision was superior to manual counts but lower than expected based solely on random error.
• Accuracy was sufficient for clinical use, though 'pseudo-basophilia' frequently caused elevated counts.
• Basophil counts remained stable for up to 3 days under tested conditions.
• Established a reference range of 0.02-0.09 x 10(9)/L.
• Elevated counts serve as an alert for abnormal samples.

Conclusions:

• The Technicon H*1 provides clinically useful basophil counts, but microscopic confirmation is vital for diagnostically significant elevated results.
• Pseudo-basophilia is a common factor in elevated automated basophil counts, necessitating careful interpretation.
• The findings are generalizable to other instruments in the Technicon H series (H*2, H*3) due to shared technology.