Boucle yarn is a loose, three ply yarn with a characteristic curly appearance. Used in weaving, knitting, and crocheting, boucle...
Cold agglutinins are antibodies that cause clumping or agglutination of RBCs at cold temperatures in individuals with certain conditions or who are infected by particular organisms. Cold agglutinins are associated with Mycoplasma pneumoniae infection. M. pneumoniae has i antigen specificity to human RBC membranes. Fetal cells largely contain i antigens, but by 18 mo most cells carry the I antigen.
The cold agglutinins test may be done to: 1  See whether high cold agglutinin levels are causing autoimmune hemolytic anemia. 2  Find pneumonia caused by mycoplasma. Over half of people with pneumonia caused by mycoplasma develop an increase in cold agglutinin levels in their blood within a week of being infected.