ENT Nose and PNS 7d6b12d9 CSF rhinorrhoea is diagnosed by: A b2 macroglobulin B b2 transferrin C Thyroglobulin D Transthyretin High-Yield Explanation (b) b2 transferrin(Ref. Cummings, 6th ed., 807)b2 transferrin on electrophoresis is pathognomonic of CSF as this protein is present only in CSF.