if you had ovarian cancer would that be something that would cause abnormal results on a regular blood test?

Not on regular blood tests. One has to ask for a specific blood test (CA125) which is not ordered regularly. It is requested by the doctors if they are suspecting Ovarian cancer.

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Your sed/rate would be very high. You might be a little anemic. Well, if you did a complete blood panel test, something might point that there's a problem there, but to be sure, do a CA125 test, which is used to diagnose ovarian cancer.