A smear macroscopically very blue: what could cause this?

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Multiple Choice

A smear macroscopically very blue: what could cause this?

A very blue smear reflects high plasma protein levels in the blood. When there are extra proteins—especially immunoglobulins or fibrinogen—the red cells lose their usual repulsion and tend to stack together in formations called rouleaux. This increased protein milieu and cell aggregation change how the smear takes up stain and appears, often giving it a noticeably blue, or highly basophilic, look. This is classically seen in hyperproteinemic states such as multiple myeloma or related gammopathies. Dehydration can change plasma concentration but doesn’t typically produce a distinctly blue smear. Iron deficiency tends to produce pale, smaller red cells rather than a blue-stained appearance. Elevated lipids don’t cause this blue coloration on the smear.

A very blue smear reflects high plasma protein levels in the blood. When there are extra proteins—especially immunoglobulins or fibrinogen—the red cells lose their usual repulsion and tend to stack together in formations called rouleaux. This increased protein milieu and cell aggregation change how the smear takes up stain and appears, often giving it a noticeably blue, or highly basophilic, look. This is classically seen in hyperproteinemic states such as multiple myeloma or related gammopathies.

Dehydration can change plasma concentration but doesn’t typically produce a distinctly blue smear. Iron deficiency tends to produce pale, smaller red cells rather than a blue-stained appearance. Elevated lipids don’t cause this blue coloration on the smear.

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