Home > Safety & Environmental Help and Guidance > HAVS Assessments > The 5 Tiers of Vibration Health Surveillance
Part of the problem with the term HAVS (Hand Arm Vibration Syndrome) is that it uses the word syndrome, which immediately makes this sound like an illness. The first thing to understand when embarking on health surveillance is that we are talking about injury, not disease, so medicalising it actually isn’t very helpful in bringing about more of an understanding in the workforce. It also doesn’t help with getting the health surveillance right in the first place.
Read on to learn about the 5 tiers to vibration health surveillance, or read our article: The Definitive Guide to Managing Hand Arm Vibration in the Workplace.
Health Surveillance is a vital tool in managing HAVS, and is a system that can be easily set up. The most crucial element of any health surveillance is to establish a baseline level. This simply means that you must find out as soon as possible after commencement of employment the current condition of someone’s health in relation to had arm vibration.
The HSE have produced a guide for employers on how to set up and run a health surveillance programme which you can download here. The essence of the guide is reasonably straight forward and follows a 5 tier structure to vibration health surveillance.
Baseline questionnaire (an example of which can be downloaded from the HSE website) which is designed to gather information about a person’s previous employment, any pre-existing health issues relating to vibration exposure or anything that may cause greater susceptibility to HAVS.
This is an annual screening questionnaire, which is intended to monitor any changes over the baseline questionnaire and to highlight individuals that may need to be referred to Tier 3 for a HAVS health surveillance check.
A qualified person would normally conduct this health surveillance assessment, which can consist of a number of elements including the use of some of the equipment below. The person conducting the test does not have to be medically qualified, but must have relevant training in the assessment of HAVS.
Hand Dynamometers can be used to measure and monitor grip strength, which in itself is not an indication of injury, but can be monitoring to gauge any changes of time.
Touch-test Sensory Evaluators can be used to monitor the nerve sensors at different points of the hand. These consist of tiny flexible filaments that can be drawn over the fingers to assess the sensitivity of touch. Once again, a change of this perception can be an indication of the progress of a vibration related injury.
Purdue Pegboards are used to measure and monitor dexterity levels, and are an industry standard method. Generally supplied with Purdue Pegboards are guideline levels for different age groups and genders, helping you benchmark your employees. Originating from the USA in the 1950’s as a means of determining the dexterity of potential manual workers for recruitment purposes, dexterity is also a factor that’s generally affected with injury from vibration and therefore it’s another important factor to monitor closely.
Tier 4 involves a formal diagnosis, which must be carried out by a medical doctor who specialises in occupational health – normally someone who is a member of the Faculty of Occupational Medicine. This person would use information provided along with their own assessment to determine the scale of any injury. The scale used for diagnosis is called the Stockholm Scale and gives a rating for 2 elements of HAVS damage and is shown below:
A diagnosis to the Stockholm scale would be given in 2 parts such as 1SN3V, which shows the extent of injury for each component.
Tier 5: Is an optional set of tests that can be called up by an occupational Doctor in determining the formal diagnosis. These tests might include:
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