what is the cost of the tissue transglutaminase ab, iga lab test?
select distinct cost.cost from cost where cost.event_type = 'labevents' and cost.event_id in ( select labevents.row_id from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'tissue transglutaminase ab, iga' ) )