When counting cells:

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Topic: When counting cells in a chamber, consider best practices for loading and counting to ensure accuracy.
Option 1: 'You should only need to count one quadrant if it has more than 400 cells.' This statement suggests counting only a single quadrant regardless of total distribution, which risks sampling bias and under- or over-counting if cells are not evenly distributed. It ignores the standard practice of verifying uniformity across quadrants before extrapolating.
Option 2: 'You should always load at least 20 uL per chamber and be sure to fill the entire chamber.' While adequate sample volume can be important, simply filling the chamber does not address how cells enter, distribute, or how to avoid overflow. It may lead to overflow or non-representative sampling, and could complicate accurate counting if the chamber design relies on capillary flow rather than manual volume.
Option 3: 'You should allow the cells to enter the chamber by capillary action and not overflow the chamber.' This option aligns with common counting protocols that rely on capillary action to load the sample evenly into the chamber, minimizing air bubbles and overfilling. It emphasizes controlled entry and maintaining chamber integrity, which are key for reliable counts.
Option 4: 'You should always count all the cells on all the edges and then average the count from all four quadrants.' While counting edges might be part of some procedures, counting every edge and then averaging across quadrants can be distracting and inefficient; edge cells may be artifacts or out of focus, and standard practice typically involves counting within defined quadrants and/or the center, not necessarily exhaustive edge counting.
In summary, Option 3 correctly captures a standard loading principle for chamber-based cell counting, focusing on controlled entry via capillary action and avoiding overflow, which supports accurate and reproducible counts. The other options contain practices that could introduce bias, overflow risk, or unnecessarily complicate the counting process.

MIMI2002 (ND) Immunology Practical Quiz

When counting cells:

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