title: Suspension of non-viable fungal spores as a standard for platelet counting.
abstract: In the search among biological particles for a standard for counting human platelets, a strain of Absidia corymbifera was found to have spores that resembled platelets. After fixing in formalin and autoclaving the spores had a similar mean cell volume to that of human platelets. A suspension of these killed spores was tested in 100 laboratories and gave consistent results as a standard for human platelet counting. The Absidia corymbifera standard can be used in electronic counting methods but not in sedimentation methods, as the spores will be removed by centrifugation.
mesh_terms: D001772:Blood Cell Count; D001792:Blood Platelets; D009090:Mucorales; D013172:Spores, Fungal