Using a cut-off of 6.98 pg/ml (the LLOD of the assay), peripherin displayed 78% sensitivity and 71% specificity in identifying GBS over CIDP (area under the curve, AUC = 0.78), whereas NfL with a cut-off value of 56.3 pg/ml displayed 82% sensitivity and 80% specificity (AUC = 0.87). The gene discussed is PRPH; the disease is Guillain-Barre syndrome.