Blood for serologic screening of infants or small children could be gathered by finger/heel stick. Capillary tubes might be used for infants. Capillary tubes need the submitter to own entry to a hematocrit centrifuge. Duodenal biopsies showed whole villous atrophy, intraepithelial lymphocytosis and a thickened basement membrane of 19 μm, https://dog-bed78765.blogkoo.com/pet-shop-in-jlt-for-dummies-55584167