preferred_name: Absence of anti-IgA mesangial staining (seen on immunofluorescence)
preferred_name_lc: absence of anti-iga mesangial staining (seen on immunofluorescence)
label: Absence of anti-IgA mesangial staining (seen on immunofluorescence)
label_lc: absence of anti-iga mesangial staining (seen on immunofluorescence)