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Visual Analog Scale For Pain

By Dr Arun Pal Singh

In this article
    • How To Use Visual Analog Scale
  • The significance of the Visual Analog Scale
  • Limitations
    • Related

Visual analog scale [VAS] is a measure of pain intensity. It is a continuous scale comprised of a horizontal (called horizontal visual analog scale) or, vertical called vertical visual analog scale usually 10 cm or 100 mm length [both the gradations are used]. It is anchored by two verbal descriptors, one for each symptom extreme.

There could be variation in verbal descriptor anchors depending on the intended use of the scale.

For pain intensity, the scale is most commonly anchored by “no pain” (score of 0) and “pain as bad as it could be” or “worst imaginable pain” (score of 100 [on 100-mm scale]

Though some scales use them, numbers or verbal descriptors at intermediate points are not recommended. This is done to avoid clustering.

Here is an image of the classic visual analog scale I have just described.

Visual Analogue Scale
Visual Analogue Scale

Usually, respondents are asked to report current pain intensity or pain intensity in the last 24 hours.

Here is another variation of the scale used. This looks more descriptive and seems user-friendly than one pictured above.

Another visual analog scale

How To Use Visual Analog Scale

The pain visual analog scale is self-completed by the respondent. The respondent is asked to place a line perpendicular to the VAS line at the point that represents their pain intensity.

After the patient has marked, using a ruler, the score is determined by measuring the distance (mm) on the 10-cm line between the “no pain” anchor and the patient’s mark.

The scores can be from 0–100.

A higher score indicates greater pain intensity.

Based on the distribution of pain VAS scores in postsurgical patients, the following cut points on the pain VAS have been recommended

  • No pain (0 –4 mm)
  • Mild pain (5–44 mm)
  • Moderate pain (45–74 mm)
  • Severe pain (75–100 mm)

The significance of the Visual Analog Scale

Pain visual analog scale is very easy to use by respondent and assessor both. Woodford and Merskey first reported the use of the VAS pain scale. The reliability of the test has shown to be good and is higher among literate

VAS has been shown to be highly correlated with a 5-point verbal descriptive scale [ mild to severe]

Limitations

Limitations to the use of the pain VAS include the following

  • older patients may have dif?culty completing the pain VAS due to cognitive impairments or motor skill issues.
  • It cannot be administered by telephone, limiting its usefulness in research.

Related

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Filed Under: Pain Management

About Dr Arun Pal Singh

Arun Pal Singh is an orthopedic and trauma surgeon, founder and chief editor of this website. He works in Kanwar Bone and Spine Clinic, Dasuya, Hoshiarpur, Punjab.

This website is an effort to educate and support people and medical personnel on orthopedic issues and musculoskeletal health.

You can follow him on Facebook, Linkedin and Twitter

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