Couple stabbed on Sydney's north shore

A man has been arrested following the stabbing of a couple on Sydney's north shore.

Emergency services were called to a unit block on the Pacific Highway in Lane Cove North just before 1pm on Friday to find a man and woman with stab wounds, police say.

They have been taken to Royal North Shore Hospital for treatment.

It's believed the woman is in a serious condition with stabs wounds to her back, while the man is stable and has wounds to his arm, Fairfax Radio reports.

Police have arrested a man, who is helping with inquiries.

A crime scene has been established and is being examined by specialist officers.