IgA (w/in 5 days); PSGN (10-21 days + low C3) June 22, 2017 mfadmin Medicine Average Rating 0 out of 5 stars. 0 votes.You must log in to submit a review. IgA (w/in 5 days); PSGN (10-21 days + low C3) IgA vs PSGN