NV2 Rhinospirometer

The NV2 Rhinospirometer is the PC based version of the former NV1 and was specifically developed to measure the partitioning of airflow between the two nasal passages. This is a unique product developed as a screening instrument, to help clinicians with guidance as to whether a subject presenting with septal deviation is likely/unlikely to benefit from septal surgery. Developed in conjunction with the Common Cold Centre in the University of Cardiff and local hospitals, it measures the ratio of volumes inspired during a single or multiple inhalation (or exhalation). The results are independent of subject effort, as the volume through each nostril is generated by a common negative inspiratory pressure at the back of the nose.

The NV2 Rhinospirometer has a number of benefits to the user:

  • Easily transportable, robust system
  • Measures and reports the volume, average flow and peak flow through each nostril
  • Ratio of volumes and results are independent of subject effort providing a more accurate assessment than a PNIF
  • Aids selection of patients for Septoplasty
  • Interfaced through a USB port
  • Software available for up to and including Windows 10
  • Rapid test which requires minimal patient co-operation
  • Allows documented confirmation of the success of procedure through pre and post measurements
  • Anatomical or conical nose pieces for rapid airtight connection to the subject
  • Provides objective measurement of the severity of nasal septal deviation
The NV2 Rhinospirometer allows the measurement of partitioning of airflow between two nasal passages.

As the patient breathes in through two nasal adaptors, the volume of air, average and peak flow air through each side of the nose is measured. A nasal partitioning ratio (NPR) is calculated from the nasal volumes and reported visually and in tables on screen, print outs and stored for comparison.

The software has been programmed to give guidance based on published work as a ‘Yes’ or ‘No’ to whether the subject is likely/unlikely to benefit. This is displayed at the end of the test, along with the relative volumes, average flow and peak flow readings for each nostril.
Clinical work published suggests that NPR values within a range of +/-0.3 are considered normal while figures greater than this indicate a degree of asymmetry, which may benefit from surgery.

The NV2 system can provide facilities for the following applications:

  • Objective measurement of severity of Nasal Septum Deviation
  • Study of Nasal cycle and Rhinitis

Developed in conjunction with the Common Cold Centre Cardiff University, UK.

Dimensions 21x8x15cm
Weight 2kg
Supply Voltage 5V USB (PC Link)
Power Consumption 3 watts
Repeatability > 2% FSD
Volume Accuracy (0–5L) > 3% FSD
Standards BS EN 60601-1: Edition 3.1 plus EMC Edition 4, Class IM, CE Mark
Warmup Time 5 Minutes
N.B: The video provided for guidance uses an earlier version of the NV2 Rhinospirometer but the protocol, application and software remain the same.

The full product brochure is available to download here:

Product Brochure (4MB)

Examples of the NV1 reference papers:

  1. Cuddihy PJ, Eccles R. The use of nasal spirometry as an objective measure of nasal septal deviation and the effectiveness of septal surgery. Clin Otolaryngol 2003;28(4):325-30.
  2. Cuddihy PJ, Eccles R. The use of nasal spirometry for the assessment of unilateral nasal obstruction associated with changes in posture in healthy subjects and subjects with upper respiratory tract infection. Clin Otolaryngol 2003;28(2):108-11.
  3. Hanif J, Eccles R, Jawad S. The use of a portable spirometer for studies on the nasal cycle. American Journal of Rhinology 2001;15:303-306.
  4. Hanif J, M JSS, R E. Spirometry vs. rhinomanometry for studies on the nasal cycle. Clinical and Experimental Allergy 2001;31(7):28-.
  5. Hanif J, Jawad SS, Eccles R. A study to assess the usefulness of a portable spirometer to quantify the severity of nasal septal deviation. Rhinology 2003;41(1):11-5.
  6. Roblin DG, Eccles R. Normal range for nasal partitioning of airflow determined by nasal spirometry in 100 healthy subjects. Am J Rhinol 2003;17(4):179-83.
  7. Boyce, J.M., & Eccles, R. Assessment of subjective scales for selection of patients for nasal septal surgery. Clin. Otolaryngol. 2006 31, 1-6.
  8. HIPPOKRATIA 2012, 16, 2: 166-169. Lateralized olfactory.

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