When you have a blood test via an NHS GP (eg I've just had my routine thyroid bloods and B vitamins done), would it be tested solely for thyroid markers/specifics or include a range of markers for others diseases in general? Reason for question is I've found a small gristly, painless lump on base of my thumb joint which I assume is probably arthritis given my age (mid 50's), so wondering if any cancer would be highlighted?