CD40LG and leprosy: Additionally, the NDO-LID serological test has been shown to detect slightly larger proportions of BL/LL and TT/BT leprosy than the serology leprosy test detecting Immunoglobulin M (IgM) antibodies to M. leprae-specific phenolic glycolipid (PGL-I) (87.0% versus 81.7% and 32.3% versus 6.5%, respectively), and it also demonstrated improved specificity [18].