Table 3.

Laboratory and In Vitro Studies of the Patients

Patient	Delay between the onset and laboratory assessment (d)	Abnormal laboratory studies	IF sciatic nerve IgG staining	DRG culture IgG staining	DRG section IgG staining	Interpretation of immunostaining reactivity
1	22	N	Schwann cells	—	—	Myelin
2	888	N	—	+	—	DRG
3	485	N	—	—	+	DRG (probably)
4	1,213	N	—	—	—	Negative
5	3,613	Anti-FGFR3 +	Unmyelinated fibers	+	+	Small fibers
6	1,370	B12 deficiency	Schwann cells at paranodes	—	+	Paranodes
7	282	Anti-FGFR3 +	Schwann cells	—	—	Myelin
8	228	Folate deficiency	—	+	+	DRG
9	1877	Anti-FGFR3 +	Unmyelinated fibers	—	—	Small fibers
10	308	Anti-CASPR2 +	Juxtaparanodes and unmyelinated fibers	+	+	Juxtaparanodes and small fibers
11	1,572	N	Paranodes	—	—	Paranodes
12	74	N	—	+	—	DRG
13	995	Iron-deficiency anemia	Unmyelinated fibers and paranodes	—	—	Paranodes and small fibers
14	34	Anti-Tg +	—	+	—	DRG
15	170	N	Unmyelinated fibers	+	—	Small fiber
16	54	Anti-TPO and anti-Tg +	—	—	—	Negative
17	26	N	—	—	—	Negative
18	962	Thrombocytopenia	—	—	—	Negative
19	1,529	High B6 level	—	—	—	Negative
20	354	Anti-FGFR3 +	—	—	—	Negative

Abbreviations: + = staining; CASPR2 = contactin-associated protein-2; DRG = dorsal root ganglion; FGFR3 = fibroblast growth factor receptor 3; IF = immunofluorescence; N = normal; TG = thyroglobulin; TPO = thyroperoxidase.