The high blood concentrations of the MB isoenzyme form of creatine phosphokinase (CPK) following severe chest pains suggest that Tom experienced a myocardial infarction ("heart attack"—see chapter 13). His difficulty in urination, together with his high blood levels of acid phosphatase, suggest prostate disease. (The relationship between the prostate gland and the urinary system is described in chapter 20.) Further tests—including one for prostate-specific antigen (PSA)—can be performed to confirm this diagnosis. Tom "got the runs" when he ate ice cream probably because he has lactose intolerance—the lack of sufficient lactase to digest milk sugar (lactose).
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