Flow cytometry of ethanol-fixed versus fresh bladder barbotage specimens

Area of Science:

• Urology
• Cytometry
• Molecular Biology

Background:

• Flow cytometry is a valuable tool for analyzing cellular DNA content.
• Standardization of sample preparation techniques is crucial for accurate diagnostic results.
• Bladder washings are commonly used for cytological and molecular analyses.

Purpose of the Study:

• To compare the accuracy and reproducibility of deoxyribonucleic acid (DNA) analyses from fresh versus ethanol-fixed saline bladder barbotage specimens.
• To determine if ethanol-fixed bladder washings are suitable for flow cytometry analysis.

Main Methods:

• Saline bladder barbotage specimens were collected from 99 patients.
• Deoxyribonucleic acid (DNA) content was analyzed using flow cytometry.
• Two cell preparation techniques were compared: fresh cells and ethanol-fixed cells.

Main Results:

• Flow cytometric DNA analyses showed consistency between fresh and ethanol-fixed specimens in 87 out of 99 cases (88% agreement).
• The agreement between the two methods was statistically significant (p < 0.0001) based on the Kappa statistic.
• The findings indicate high concordance between the preparation techniques.

Conclusions:

• Accurate and reproducible deoxyribonucleic acid (DNA) analyses can be obtained from ethanol-fixed bladder washings.
• Ethanol-fixed bladder washings are a viable option for flow cytometry analysis.
• This standardization allows for reliable sample submission to flow cytometry centers, improving diagnostic accessibility.