. Author manuscript; available in PMC: 2020 Sep 1.

Published in final edited form as: Clin Chest Med. 2019 Sep;40(3):583–597. doi: 10.1016/j.ccm.2019.05.005

Table 3:

Useful Lab Tests When Evaluating a Patient for IgG4-Related Disease

Lab Test	Reason for Test
General
IgG Subclasses	IgG4 elevated in ~70% of patients with IgG4-RD
IgE and Peripheral Eosinophilia	May be elevated in patients with IgG4-RD; may predict risk of flare after treatment
Renal Disease
CH50, C3, and C4	Often low in IgG4-related renal disease
Creatinine and Glomerular Filtration Rate	To evaluate for potential IgG4-related renal disease
Urinalysis	Proteinuria may be present in IgG4-related renal disease
Pancreatic Disease
Amylase and Lipase	To evaluate for potential IgG4-related pancreatitis
Bilirubin	To evaluate for potential IgG4-related pancreatitis
A1c	To evaluate for potential IgG4-related pancreatitis causing endocrine insufficiency
Stool elastase	To evaluate for potential IgG4-related pancreatitis causing exocrine insufficiency