Test procedure is very easy. Analysis consists of 2 parts:
Part I. Detection of basal level value.Patient to take the tube into his/her mouth. Aspirate the breath air during the period indicated at the label on the pump (6 or 7 minutes).
Part II. Detection of load level value after a portion of urea is taken. Ask the patient to take 0,5 g urea dissolved in 50 ml water. After he/she drinks turn the indicator tube the other side and start the second aspiration.
When test finished compare the basal level value with the load level value. Count the delta by distracting the basal level value from the load level value.If the delta exceeds the 3 mm, the test is positive; the delta is less than the 3 mm, the test is negative.
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