A comparative study of cytological processing techniques in hemorrhagic effusion

Area of Science:

• Cytopathology
• Laboratory Medicine
• Histology

Background:

• Fluid cytology specimens frequently contain erythrocytes, which can obscure cellular details and hinder accurate diagnosis.
• Existing methods for erythrocyte removal in cytology smears have varying degrees of effectiveness.
• Improving smear quality is crucial for reliable cytological assessment.

Purpose of the Study:

• To compare the efficacy of three techniques for lysing red blood cells (RBCs) in hemorrhagic cytology samples.
• To evaluate the impact of these techniques on smear quality and cytomorphological assessment.
• To identify the optimal method for improving the diagnostic yield of bloody cytology specimens.

Main Methods:

• A prospective study was conducted over 1 year and 6 months, processing hemorrhagic effusions.
• Three techniques were compared: Carnoy's fixative (CF), modified CF, and normal saline rehydration technique (NSRT).
• Smear background, cytomorphological details, and staining quality were analyzed; the Chi-square test assessed RBC reduction.

Main Results:

• Normal saline rehydration technique (NSRT) achieved over 60% RBC reduction in 85.40% of cases.
• Modified CF and CF showed over 60% RBC reduction in 14.60% and 15.60% of cases, respectively.
• NSRT demonstrated superior staining quality and better preservation of nuclear features.

Conclusions:

• Normal saline rehydration technique (NSRT) is the most effective, simple, and cost-efficient method for lysing RBCs in hemorrhagic fluids.
• NSRT significantly improves smear quality, enhancing cytomorphological evaluation.
• This technique is recommended for routine use in cytology laboratories handling bloody specimens.