Which sensory deficit was documented on exam of the left hand?

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Sensory findings are best understood by mapping them to specific nerve distributions in the hand. The index finger on the left is supplied mainly by the median nerve through its digital branches, so a deficit isolated to that finger points to involvement of the left median nerve distribution. The palm is a broader area and would suggest more extensive involvement of the palmar surface, not just a single digit. The ring finger on the left would implicate the ulnar nerve distribution, not the median nerve, and a deficit on the right index finger would indicate a problem on the opposite hand, which doesn’t match a left-hand exam. So a documented deficit in the left index finger best fits a localized issue in the left median nerve/digital nerve supply.