title: Beta-trace protein as sensitive marker for CSF rhinorhea and CSF otorhea.
abstract: OBJECTIVE
  Beta-trace protein concentrations in cerebrospinal fluid (CSF), serum and nasal secretions are investigated with a new quantitative, immunonephelometric assay.
  
  
  RESULTS
  The mean beta-trace concentration of normal lumbar CSF (18.4 mg/l) and normal serum (0.59 mg/l), from n = 132 control patients, were 10% higher than reported earlier for smaller control groups. The reference range of beta-trace protein in nasal secretions is very low (median: 0.016 mg/l, range <0.003-0.12 mg/l, for n = 29 controls). Clinically confirmed cases of CSF rhinorhea (n = 20) showed beta-trace concentrations between 0.36 and 53.6 mg/l, with a median of 2.4 mg/l. We propose a cut-off value of 0.35 mg/l above which a CSF contamination in the secretion is plausible. A clinically confirmed CSF otorhea had a value of 1.75 mg/l.
  
  
  CONCLUSIONS
  This new beta-trace protein assay offers a fast, sensitive and reliable routine method to detect a CSF rhinorhea or otorhea.
authors: Neurochemisches Labor, Universität Göttingen, Goettingen, Germany. h.reiber@med.uni-goettingen.de
authors: H
authors: H
authors: Reiber
authors: K
authors: K
authors: Walther
authors: H
authors: H
authors: Althaus
mesh_terms: D001609:Beta-Globulins / Q000134:cerebrospinal fluid*; D015415:Biomarkers / Q000134:cerebrospinal fluid; D001812:Blood-Brain Barrier; D002558:Cerebrospinal Fluid Otorrhea / Q000134:cerebrospinal fluid* / Q000175:diagnosis*; D002559:Cerebrospinal Fluid Rhinorrhea / Q000134:cerebrospinal fluid* / Q000175:diagnosis*; D006801:Humans; D019746:Intramolecular Oxidoreductases / Q000134:cerebrospinal fluid*; D054834:Lipocalins; D012016:Reference Values; D012680:Sensitivity and Specificity
chemical_list: D001609:Beta-Globulins; D015415:Biomarkers; D054834:Lipocalins; D019746:Intramolecular Oxidoreductases; C022466:prostaglandin R2 D-isomerase