To make a diagnosis.
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1) to recognize (as a disease) by signs and symptoms
2) to diagnose a disease or condition in <diagnosed the patient> vi to make a diagnosis
di·ag·nos·able also di·ag·nose·able .dī-ig-'nō-sə-bəl, -əg-, -zə- adj
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di·ag·nose (diґəg-nōs″) to make a diagnosis of; to recognize the nature of an attack of disease.Medical dictionary. 2011.