Would you ever consider sending any labs to help determine if a certain level of systemic inflammation could interfere with novel amyloid blood-based biomarkers for the detection of brain amyloid?

Not at this time. If I have concerns about using blood-based biomarkers in a specific patient (due to CKD, other chronic conditions, etc) but have reason to rule Alzheimer's disease in or out, I go straight to amyloid PET CT instead.