24 A common test kit for rheumatoid factor RF contains a sal

24.    A common test kit for rheumatoid factor (RF) contains a saline diluent, positive and negative controls, and an IgG-latex particle complex. A positive reaction is indicated by agglutination of the latex particles. In this procedure, which of the following statement(s) is (are) true?

         a.      It is a “passive” hemagglutination test.

         b.      Patient serum should be inactivated before testing.

         c.      The RF in patient serum primarily represents IgM immunoglobulin.

         d.      The test is specific for rheumatoid arthritis.

25.    The Weil-Felix test is used to evaluate patients suspected of having

         a.      Proteus infections

         b.      Rocky Mountain spotted fever

         c.      Autoimmune thrombocytopenic purpura

         d.      Typhoid fever

Solution

(24) a.      It is a “passive” hemagglutination test.

test kit for rheumatoid factor (RF) uses a passive hemagglutination test to detect rheumatoid factor.

(25) d. Typhoid fever

The Weil–Felix test is an agglutination test for the diagnosis of Typhoid fever.