Standardization of Romanowsky stains. The relationship between stain composition and performance

Area of Science:

• Hematology
• Stain Technology

Background:

• Romanowsky stains are crucial for differential blood cell counts and bone marrow analysis.
• Standardization of stain formulations is essential for consistent diagnostic accuracy.

Purpose of the Study:

• To assess the performance and acceptability of five different Romanowsky stains prepared from pure component dyes.
• To compare the efficacy of these stains in routine blood and bone-marrow film preparation.

Main Methods:

• A panel of 17 hematologists evaluated five distinct Romanowsky stain formulations.
• Stains were assessed based on their suitability and acceptability for routine blood and bone-marrow films.
• Performance was compared between stains, including those described by Marshall et al. (1975) and Wittekind et al. (1976).

Main Results:

• The stain formulation by Marshall et al. (1975) demonstrated performance comparable to a modification of the Wittekind et al. (1976) stain.
• Three of the five evaluated Romanowsky stains exhibited less acceptable performance.
• Significant correlations were found between variations in stain formulation and overall stain performance.

Conclusions:

• The findings highlight the variability in Romanowsky stain performance based on formulation.
• The Marshall et al. and Wittekind et al. stain modifications are recommended for routine hematological film preparation.
• Further research into stain formulation optimization is warranted to ensure consistent diagnostic quality.