After receiving a referral at work, doug seeks a clinical evaluation of his increasingly eccentric behaviors. doug also displays social detachment, and some perceptual distortions. he would most likely be diagnosed by an experienced clinician with

Schizotypal personality disorder

Explanation:

Doug would most Likely be diagnosed with Schizotypal personality disorder(STPD).

A schizotypal personality disorder is a type of Mental disorder in which an individual exhibits social anxiety, Paranoid ideation, inappropriate social responses, Peculiar and unusual behavior.

People with this disorder avoid forming relationships as they think peers might harbor negative feelings about them. These people need a constant need for medication for anxiety attacks.

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the answer would be in this answer. someone already asked the question.