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My husband has been on Keytruda for almost two and a half years now. It has worked very well for him, with no side effects except from mild vitiligo on his face and hands. His blood tests were fine as well, but he has noticed a gradual drop in his hematocrit levels and now it's on 39. Is it possible that Keytruda causes this drop? When he asked his doctors they told him it is the hemoglobin they're interested in and didn't give much notice. Thank you