Cell Viability Detection

White Paper about The New Frontier of Cell Viability Detection

Cell viability assessment is fundamental to biological research, yet traditional methods detect only late-stage cellular damage. Conventional approaches like Trypan Blue staining miss critical early indicators of cellular stress. CytoDirect, METTLER TOLEDO's cell counter, uses Digital Holographic Microscopy (DHGM) technology to detect subtle morphological changes that precede cell death, providing researchers with a comprehensive understanding of cellular viability dynamics.

In this white paper, we will assess how our cell counter CytoDirect provides a more nuanced, continuous assessment of cell viability beyond the traditional binary live or dead classification, offering researchers deeper insights into cellular health and response during experiments.

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Why Cell Viability Methods Can Produce Different Results

Cell viability cannot be measured directly. Different methods evaluate indirect indicators such as membrane integrity, metabolic activity or molecular markers. Because these indicators occur at different stages of cell death, methods such as Trypan Blue, MTT assays and flow cytometry can produce significantly different viability results for the same cell population.

Download the white paper to compare cell viability methods and understand why results can differ.

How Do Image-Based Methods Compare to Other Cell Counting Methods?

See the full side-by-side comparison, including accuracy, viability assessment, sample preparation, and cost, on the Cell Counting Methods page.

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Detecting Morphological Changes During Cell Death

Cell death is a continuous process involving changes in cell volume, mass density, refractive index and structural integrity. Digital Holographic Microscopy can detect these morphological changes, including cell shrinkage and changes in cytoplasmic appearance, allowing cellular decline to be observed beyond a simple live/dead classification.

Download the white paper to discover how Digital Holographic Microscopy reveals subtle changes throughout the cell death process.

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Stain-Free Viability Analysis With CytoDirect

CytoDirect combines Digital Holographic Microscopy with a trained convolutional neural network to analyze cellular morphology without staining. Its Viability Map assigns each detected cell a viability score and visualizes viable, dying, and dead cell populations, including intermediate states that traditional binary methods may not differentiate.

Explore how CytoDirect enables stain-free viability assessment and reveals intermediate stages of cell death in the white paper.

What Is Digital Holographic Microscopy?

Digital Holographic Microscopy, or DHM, captures a hologram of each cell instead of a direct image. CytoDirect combines DHM with machine learning to measure cell concentration and viability without dyes or stains. This approach preserves sample integrity and removes the manual staining steps required by traditional cell counting methods.