The sensation of obstruction of nasal patency is a common symptom in patients with a cold, nasal polyps and inequalities of the nasal septum. It is very variable as regards subjective evaluation, it is difficult to quantify in clinical practice, more difficult than complete obstruction. A generally accepted method for assessment of nasal patency is rhinomanometry but the high price of the instrument does not make its use possible in every department. By assessment in clinical practice it is possible to assess the extent of the structural deformity of the septumand by assessment after anaemization also the extent of the mucosal participation in the nasal resistance. For experimental purposes it is useful for measuring the effect of drugs which influence mucosal decongestion. In liminal indications of septoplasty it facilitates the decision of surgery or conservative treatment of nasal obstruction, after operation it makes it possible to evaluate its effect. The objective of thework is tomakethe professional public familiar with the principle of themethod, clinical endoscopic findings and the corresponding rhinograms.

        Key words: rhinomanometry, nasal patency, nasal septum.