• Welcome to Phoenix Rising!

    Created in 2008, Phoenix Rising is the largest and oldest forum dedicated to furthering the understanding of and finding treatments for complex chronic illnesses such as chronic fatigue syndrome (ME/CFS), fibromyalgia (FM), long COVID, postural orthostatic tachycardia syndrome (POTS), mast cell activation syndrome (MCAS), and allied diseases.

    To become a member, simply click the Register button at the top right.

IgG subclasses


Donate Advocate Demonstrate
Is it possible for low Normal IgG subclasses to have any bearing whatsoever? I am thinking of specifically low subclasses and frequent respiratory infections.

What about low normal total IgG - Do either of these things mean anything or is it nonsense to even think about it?