Shown below is an iron-hematoxylin stain of a concentrated fecal preparation with characteristic protozoan cysts. The cysts measure approximately 10 to 12 micrometers in greatest dimension.
Bobbi Pritt, M.D.
Vice Chair of Education, Department of Laboratory Medicine
Consultant, Division of Clinical Microbiology
Associate Professor of Laboratory Medicine and Pathology,
Mayo Clinic College of Medicine
Follow her on Twitter: @parasitegal