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It is commonly said that agitated/fractious dogs and cats can show high levels of PCV due to the contraction of the spleen. It is also known that the contraction of the spleen is caused by the release of epinephrine. One study in the 80s on cats published in AmJVetRes demonstrates that the existence of the spleen leads to a false increase in PCV levels (compared to splenectomized cats). Your cases seem to fit with the evidence above. As you probably have been doing, it is best not to change anything but to monitor the PCV levels longitudinally to monitor the patients as long as the patients are stable.
However, it is important to make sure that you are not missing any concurrent conditions that can lead to dehydration (hence false increase in PCV) especially when your feline IMHA patients are on prednisolone; diabetes mellitus, pyelonephritis, the progression of underlying kidney disease, etc.
Please feel free to contact your local veterinary internists if available.