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That's true of many species of parasites. There are many factors when performing a fecal: age of sample/the amount of feces/sample just might not have any oocysts/ poorly trained staff. I like to do the spin-down method if I have enough sample. Scientists claim spinning down the sample after it is strained in the proper solution and then spun in a centrifuge is a more accurate method, though it takes more time, uses more materials, so this method is often overlooked in many veterinary practices. Though a fecal sample can give a false negative result, it should never be overlooked as part of the diagnostic procedure in a challenging case.