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Section 2 of 6 · Open sections

Required section · Section 2 of 6

Two Ways Cells Come Together

Rouleaux are orderly, curving stacks of adjacent RBCs, often most evident in the thicker smear area; surrounding single RBCs remain visible. Agglutination is irregular, multidirectional clumping in the monolayer, with variable clump size and single RBCs around clumps. A localized edge artifact is not either pattern.

A saline evaluation is an authorized, interpretive-only morphology comparison, not a CBC correction: under the validated local method, make the approved isotonic-saline replacement or dilution preparation and compare an equivalent smear area before and after manipulation. Its purpose is to test whether an orderly stack disperses in a changed protein environment. Record complete dispersion (single RBCs replace the stacks), partial dispersion (stacks decrease but remain), or absent dispersion (no meaningful change). It may support a rouleaux interpretation, but it neither diagnoses a cause nor establishes CBC validity.

Choose separate branches from the shown evidence: orderly stacks with stable, coherent results may undergo the authorized saline evaluation; irregular monolayer clumps with implausible RBC-associated results require the validated warming-and-rerun branch; failed stability or specimen integrity requires recollection. Missing required observations also prevent corrective release. Persistent clumps, absent/failed correction, or a repeat that fails acceptance ends in hold, qualified review, and escalation rather than release.

Illustrative drawing — this picture was drawn rather than captured.

Text diagram compares usual surface separation with reduced separation from macromolecular plasma proteins that permits coin-stack contact.
Figure 1Map of arrangement mechanisms; it is not a recognition image.

Illustrative drawing — this picture was drawn rather than captured.

Text callouts describe curving orderly RBC stacks with surrounding single RBCs for rouleaux in the thicker smear area, and irregular multidirectional clumps with surrounding single RBCs for agglutination in the monolayer.
Figure 2Text comparison of orderly rouleaux and irregular agglutination by smear area; callouts are teaching text, not images.

Observed arrangement to conditional release workflow

  1. Observe smear evidence

    Compare monolayer, thicker area, clump shape, neighboring single RBCs, and distribution.

  2. Conditional saline comparison

    For orderly stacks with stable, numerically coherent results, use the authorized saline comparison and record complete, partial, or absent dispersion. It is interpretive only.

  3. Conditional warming and rerun

    For irregular monolayer clumps plus implausible RBC-associated results, follow validated warming, mixing, and prompt rerun; verify the repeat smear and acceptance evidence.

  4. Conditional recollection

    When specimen stability, integrity, or required evidence fails, recollect under the local procedure rather than applying a correction.

  5. Release, hold, or escalate

    Release only if clumps are absent and flags, numerical consistency, specimen stability, and local criteria are acceptable. Persistent clumps or a failed correction require hold, qualified review, and escalation.

Knowledge checks

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Knowledge check 1

Which monolayer pattern is most consistent with rouleaux?

Choose one option.

Knowledge check 2

Select the statements supported by the mental model.

Choose at least 2 options.

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