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"With arms at 90 degrees, measure vertically from the tip of the elbow to the top of the hips. Adjustable height armrests are usually recommended. For users who will be doing stand-up pivot transfers, consider full length armrests. The standard armrest style is desk length, which allows wheelchair users to get in close to tables and desks."
<https://www.discountramps.com/how-to/mobility/measure-manual-wheelchair/a/b95/>