Hi Kari,
My onc does a CBC before each treatment (every three weeks) which is just a finger stick and a few drops of blood. He does additional testing every other treatment, which I have yet to get a copy of, so I don't know what he is testing for. I should say that he is in private practice and has a laboratory at his office where they do the CBC work, so that may influence the frequency. He said it is his practice to get this blood work regularly on all his patients, so I don't think it is Herceptin specific.
Good luck to you.
Hopeful
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