How specific are elevated IgG4 levels for IgG4-related disease?

How specific are elevated IgG4 levels for IgG4-related disease? Eur J Intern Med. 2021 Feb 01;: Authors: Schils M, Betrains A, Vanderschueren S, Bossuyt X, Blockmans D PMID: 33541828 [PubMed - as supplied by publisher]

https://www.ncbi.nlm.nih.gov/pubmed/33541828?dopt=Abstract

Source: European Journal of Internal Medicine - February 1, 2021 Category: Internal Medicine Authors: Schils M, Betrains A, Vanderschueren S, Bossuyt X, Blockmans D Tags: Eur J Intern Med Source Type: research

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