Merck Manual

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Equine blood smear, rouleau formation
Equine blood smear, rouleau formation

Blood smear from a horse that exhibits rouleau formation of RBCs, a normal finding in this species. An eosinophil is also present. Platelets stain poorly, a common characteristic of equine blood (Wright-Giemsa, 100X oil immersion).

Courtesy of Dr. John W. Harvey.

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Red Blood Cells in Animals