NPPB and androgen insensitivity syndrome: Biomarker panels have also been explored: in a study of 189 patients with AIS and ICH enrolled within 4.5 h after onset, a panel including retinol binding protein (RBP-4), N-terminal pro-B-type natriuretic peptide (NT-proBNP), and GFAP achieved a specificity of 100% for AIS detection.