For example, to determine whether the Watson-Schwartz urine test is positive for porphobilinogen or urobilinogen, chloroform is added to the test tube.
2
The jaundice is deep with itchy skin, pale stools and dark urine containing bilirubin but no urobilinogen.
3
Urobilinogen is slightly insoluble in water, while porphobilinogen tends to be water-soluble.