In a direct Coombs' test a special antibody is added to a sample of blood. This test checks whether there are antibodies already bound to the surface of the red blood cell. If the test is positive the antibodies that are added bind to the antibodies on the surface of the cell.
The River Hull is a navigable river in the East Riding of Yorkshire in the north of England. It rises from a series of springs to the west of Driffield, and enters the Humber estuary at Kingston upon Hull.
The river, which is the dividing line between West and East Hull, bisects the city's industrial area. The bridges can cause ship traffic delays during high tides, though river traffic is less than it once was. The Beverley and Barmston Drain rejoins the river above Scott Street Bridge.