<prompt> Rapid antigen test for Leishmania uses which antigen -HRP-1HRP-2rk-39p-24  <response>: Ans. is c i.e., rk-39 The rk-39 rapid immunochromatographic test ICT in now being widely used in the diagnosis of visceral leishmaniasis using serum.Laboratory diagnosis of Kala-azar visceral leishmaniasis The demonstration of parasite LD bodies in the aspirates of the spleen, liver, bone marrow or lymph node is only way to confirm visceral leishmaniasis. Hematological findings : ESR, anaemia, reversed albumin-globulin ratio leucopenia. Aldehyde test of Napier is a simple test widely used in India for the diagnosis of Kala-azar. Serological test: Direct agglutination test, rk 39 dipstick test, ELISA Indirect fluorescent antibody test. Leishmanin test: This test is based on skin reaction and represent delayed hypersensitivity. 