flyinpig14

We have seen the monoclonal Anti-IgG miss an anti-JMH which reacted strongly with Rabbit anti-IgG. JMH's are generally IgG4, so it makes sense. I doubt this is the case in your patient though, since we normally see anti-JMH in older patients. But I would agree, it is probably due to some kind of IgG4 antibody.