Glucose was clamped on day 4 ( to coincide with the approximate albiglutide maximum plasma concentration ) at 9.0 , 5.0 , 4.0 , 3.3 and 2.8 mmol/l ( 162 , 90 , 72 , 59.4 and 50.4 mg/dl ) , with a post-clamp recovery period to 3.9 mmol/l ( 70mg/dl ) .