Hat Administration


Before Administrating the HAT:

  1. Children should be between 4 to 19 years of age and have hypertonia (increased resistance to passive stretch of the muscle) in at least one limb.
  2. Determine the limb you will be assessing (you can assess all limbs with hypertonia, but do each limb separately and generate a HAT score for each limb).
  3. The child/youth should be supine on the examining table in comfortable, unrestrictive clothing with their hand or foot of the limb you are examining bare (e.g. out of splints and socks). If possible, their hands should be placed gently on their upper abdomen.
  4. Place a roll under the child’s knees and a pillow under the child’s head.


Administration of the HAT:

NOTE: Complete ALL 7 items on one extremity before moving to the next hypertonic extremity. It usually takes less than five minutes to complete the HAT assessment on one limb. Items are listed in the suggested order of administration.



Scoring of the HAT:

The HAT consists of seven items in total: 2 spasticity items, 2 rigidity items and 3 dystonia items. Each item is scored using a yes/no format. The presence of at least one item of the subgroup confirms the presence of the subtype of hypertonia and the presence of items from more than one subgroup identifies the presence of mixed tone.

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