Is it better that the suv max on a pet scan is lower than higher? does this mean the cancer is less aggressive and less active what is the highest it can be !

PET & SUV: most PET scans have a range of SUV that goes from 0 to 4, which is felt to be less likely malignant. The SUV above 4 is more suspicious of cancer. PET scans pick up spots where the tissues are using more energy...like infections, surgery sites, and cancers. There really is no upper limit. If your SUV is declining this usually means the cancer is responding or dying off.

SUV: SUV refers to amount of metabolic activity (glucose uptake) and often corresponds to tumor grade. Lower is usually better. A higher tumor grade usually has higher SUV. SUVs can be very high. There is no exact cutoff.