A method and apparatus for measuring biopotentials at a test site on a human or animal subject and determining therefrom the existence or status of a condition at such test site. The efficacy of treatment of a condition is monitored by comparing values obtained from biopotentials taken before treatment with those obtained during or after treatment. For disease diagnosis or screening, values obtained from biopotential measurements taken during a test period are processed in a neural network which has been programmed to recognize potential value patterns indicative of a disease condition.
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