I have just been diagnosed with MCI, but the neuropsychologist said she "thought" that it was not related to Alzheimers, but mainly a result of my heart bypass surgery in 2016. But that's her "guess", it's not fact. I have a neurologist appointment next month. From my research I believe I'm seeing that a PET scan, or spinal fluids tests can show DEFINITIVELY whether my MCI is related to Alzheimers, or not. What does anyone out there know about this?