Do we say: "The doctor is in consultation with a patient OR the doctor is on consultation with a patient."
Thank you

Question

Do we say: "The doctor is in consultation with a patient OR the doctor is on consultation with a patient." 
Thank you

Answer

"The doctor is with a patient."
"The doctor is consulting with a patient."

My last choice would be
"The doctor is in consultation with a patient"
because I don't like using big complicated words for no reason.  There are some unusual situations where "on" might be better.  For example, if the doctor has left the office to visit a sick patient somewhere else, I might say he was "on consultation".

Answer

"The doctor is in a consultation with a patient" sounds more natural to me. I'd add the article "a" before "consultation."

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