Technical Accuracy

  • Ewa Grodzinsky
  • Märta Sund Levander


Temperature is a measure of the hotness or coldness of an object, where hot has a higher ‘temperature’ than cold. The measurement of temperature is a well-established field of metrology (measurement science), which broadly divides into two practical methods of implementation: contact and non-contact thermometry. Technical accuracy includes different terms. Calibration is the process of attributing a traceable temperature to the output of a thermometer by comparison to a standard source. The traceability is ensured when measurement can be demonstrably related to a common standard. Clinical thermometers can be of two main types: direct mode or adjusted mode. Other factors affecting measurement performance are, for example, time response and measurement site. There are different types of clinical thermometers available for body temperature measurement.


  1. 1.
    IEC. Procès-Verbaux du Comité International des Poids et Mesures, 78th meeting. pp T1–T21 (French version) and pp T23–T42 (in English). Geneva: Electrotechnical Commission (IEC); 1989.Google Scholar
  2. 2.
    Quinn T. Temperature. 2nd ed. London: Academic Press; 1990.Google Scholar
  3. 3.
    Fraden J. Medical infrared thermometry (review of modern techniques). Temperature – its measurement & control in science & industry. 1992;6:825–30.Google Scholar
  4. 4.
    Simpson R, Machin G. Infrared ear thermometry: traceability and calibration at the National Physical Laboratory. IPEM ASM. 2003:150–1.Google Scholar
  5. 5.
    Simpson R, Machin G, McEvoy H, Fusby R. Traceability and calibration in temperature measurement: a clinical necessity. J Med Eng Technol. 2006;30(4):212–7.CrossRefGoogle Scholar
  6. 6.
    Ishii J, Fikuzaki T, McEvoy H, Simpson R, Machin G. A comparison of the blackbody cavities for infrared thermometers of NMIJ, NPL, and PTB. 9th international symposium on temperature and thermal measurements in industry and science; Dubrovnik: Tempmeko; 2004.Google Scholar
  7. 7.
    McEvoy H, Simpson R, Machin G. New blackbody standard for the evaluation and calibration of tympanic ear thermometers at the NPL, United Kingdom. In: Burleigh Dea, editor. Thermosence XXVI proceedings of the SPIE. 5405; np: 20042004. p. 56–60.Google Scholar
  8. 8.
    ISO/IECI. General requirements for the competence of testing and calibration laboratories ISO/IECI 17025. Geneva: International Organization for Standardization; 1999.Google Scholar
  9. 9.
    ASTME. ASTME 1965–98 (US) Standard specification for infrared thermometers for intermittent determination of patient temperature. 2009.Google Scholar
  10. 10.
    EN. Clinical thermometers. 2009.Google Scholar
  11. 11.
    JIS. Infrared Ear Thermometers. First publ. 25 March 2005, confirmed 25 October 2014. 4207 JIS T 4207 (Japan)
  12. 12.
    Mackechnie C, Simpson R. Traceable calibration for blood pressure and temperature monitoring. Nurs Stand. 2006;26(11):42–7.CrossRefGoogle Scholar
  13. 13.
    Crawford D, Wentworth S. Thermometer review 2005.Google Scholar
  14. 14.
    Ring F. Reynaud’s phenomenon: assessment by thermography. Thermology. 1988;3:69–73.Google Scholar

Copyright information

© The Author(s) 2020

Authors and Affiliations

  • Ewa Grodzinsky
    • 1
  • Märta Sund Levander
    • 2
  1. 1.Department of Pharmaceutic ResearchLinköping UniversityLinköpingSweden
  2. 2.Department of NursingLinköping UniversityLinköpingSweden

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