His work on detection of radio-
cobalt-labeled B12 in the
urine led to a test for vitamin B12 absorption named the "
Schilling test" in his honor. The Schilling test determines if a patient has
pernicious anemia, a
disease caused by
malabsorption of B12 due to lack of
intrinsic factor. The Schilling test in a second stage may also be used as a
control test for other causes of malabsorption of Vitamin B12 even if it is bound to intrinsic factor (B12 deficiency which is not pernicious anemia). ==References==