5 year check up for non hodgekins lymphoma

My dad has been cancer free for 4 years as per the blood tests he has been going to yearly , he went to his 5 year check up and mentioned any concerns he might have with kidneys etc they have done a biopsy of the abdomen and a Ct scan and another pet Ct contract scan a few days after this  . Is this normal procedure for 5 year check up or would they only do this if they see something on the scan ? 

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