Is there blood work that can determine if someone has any form of cancer.......an where can this be done?

Wish: There are blood markers for certain types of cancers but you cannot screen for everything at once.

It depends.: This depends on the type of tumor being checked for. Some, like ovarian cancer have tumor markers that can be checked, but they must be combined with other tests. Others have antigens, like psa or prostate specific antigen for prostate cancer, that can be measured, but they can be high in other conditions, like hyperplasia of the prostate, or can even be low in cancer. Others have no marker.