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<p>The genetics of Huntington's disease are complex and the likelihood of an Armed
Forces candidate developing the disease and the likely age of presentation are dependent
on the number of gene repeats. In some cases it is possible to predict these with
a high level of certainty, based either on genetic testing of immediate relatives
or of the candidate themselves.</p><p>Candidates known to be carriers of the gene
associated with Huntington's disease are normally graded medically unfit for service.
Candidates with a proven, immediate family history of this condition are also normally
graded medically unfit unless known not to carry the gene.</p><p>If there is clear
evidence that a candidate is unlikely to develop Huntington's disease during a Service
career then they may, on a case by case basis, be considered medical fit for service.
It is for the candidate to provide this evidence, which must be supported by an appropriately
qualified and experienced specialist.</p>
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