Fortified foods contain vitamin D in the form of either D2 or, more commonly, D3, which is the type produced by human skin exposed to sunlight. Salmon, tuna, swordfish and mackerel are examples of fish whose flesh contains vitamin D, notes the NIH Office of Dietary Supplements.
Definition of Wassermann test. : a test for the detection of syphilis using the Wassermann reaction âcalled also Wassermann.
Qualitative tests determine the presence or absence of an antigen or antibody. Blood grouping tests that are performed to determine the presence or absence of an antigen using an antibody of known specificity are qualitative tests.