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Overview Of Cell Separation And Isolation

Overview Of Cell Separation And Isolation

Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.

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Related Experiment Video

Updated: Feb 28, 2026

Cell Block Preparation from Cytology Specimen with Predominance of Individually Scattered Cells

Cell Block Preparation from Cytology Specimen with Predominance of Individually Scattered Cells

Published on: July 21, 2009

Cellularity of Routinely Prepared Cell Blocks: Insights From an International Study.

Irena Srebotnik Kirbis¹, Ivana Kholova^2,3,4,5, Heini Huhtala⁶

¹Institute of Pathology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.

Cytopathology : Official Journal of the British Society for Clinical Cytology

|February 26, 2026

Summary

This summary is machine-generated.

Cell block preparation methods show significant variability in cellularity, impacting diagnostic accuracy. Standardizing these methods is crucial for reliable cytology specimen processing.

Keywords:

cell block cellularity cytology preparation method

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Last Updated: Feb 28, 2026

Cell Block Preparation from Cytology Specimen with Predominance of Individually Scattered Cells

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Single-cell Analysis of Immunophenotype and Cytokine Production in Peripheral Whole Blood via Mass Cytometry

Single-cell Analysis of Immunophenotype and Cytokine Production in Peripheral Whole Blood via Mass Cytometry

Published on: June 26, 2018

Area of Science:

Cytopathology
Histopathology
Laboratory Medicine

Background:

Formalin-fixed, paraffin-embedded (FFPE) cell blocks (CBs) are standard for cytology specimens.
Preparation methods are variable and non-standardized, often leading to low cellularity.
Low cellularity can compromise the diagnostic utility of cell blocks.

Purpose of the Study:

To evaluate the cellularity of routinely prepared FFPE cell blocks.
To compare cellularity across different preparation methods, laboratories, and sample types.
To identify variability in cell block preparation and its impact on diagnostic adequacy.

Main Methods:

A multicentre observational study assessed 1817 FFPE cell blocks.
Cellularity was semi-quantitatively evaluated on H&E-stained sections by two independent reviewers.
Poorly cellular cell blocks (acellular or low cellularity) were compared across preparation methods, laboratories, and sample types.

Main Results:

The proportion of poorly cellular cell blocks varied widely (4% to 80%) across laboratories.
Median proportions of poorly cellular cell blocks ranged from 12% (Cellient) to 35% (Agar) by method, with no statistically significant differences.
Substantial variability in cellularity was observed across and within sample types and preparation methods.

Conclusions:

Marked variability exists in the proportion of poorly cellular cell blocks among different preparation methods and laboratories.
There is a clear need for improved processing and monitoring of cell block adequacy.
Standardization of cell block preparation is essential to ensure diagnostic reliability.