European journal of clinical investigation
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Eur. J. Clin. Invest. · Oct 2005
Silent and humming nasal NO measurements in adults aged 18-70 years.
The concentration of nitric oxide (NO) measured from the nose is much higher than in the lower airways and increases during humming. We assessed nasal NO (nNO) normal values during breath hold and during humming in healthy adults. ⋯ We present normal values for nNO in adults, which can be used to assess the value of nNO in respiratory illnesses. The peak nNO values during humming are variable, and their clinical relevance remains to be shown.