He was scheduled for TURP with cystoscopy under anesthesia based on his symptoms, however, he developed shaking chills over the weekend prior to admission with fevers to 101 and 102.

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He was scheduled for TURP with cystoscopy under anesthesia based on his symptoms, however, he developed shaking chills over the weekend prior to admission with fevers to 101 and 102.

This is a run-on that can be fixed by adding a comma after "weekend."