Chair and Wheelchair Scales for Reduced-Mobility Patients

For patients who cannot stand safely, the choice is between transferring them into a weighing chair or weighing them in their own wheelchair. Each has a place.

Chair scales

A seat mounted on a weighing platform. The patient transfers into it, the chair weight is built into the calibration, and the display reads patient weight directly.

Suits: patients who can transfer with assistance, geriatric and rehabilitation settings, dialysis units where the same patients are weighed repeatedly.

Check before every transfer: castor brakes locked, armrests and footrests positioned, and the patient's feet clear of the floor — a foot touching down takes weight off the scale and under-reads.

Wheelchair platform scales

A low ramped platform the wheelchair rolls onto. No transfer at all, which matters for patients where transfer is painful, risky or simply not possible.

The complication is tare: you must subtract the wheelchair weight. Two approaches:

• Weigh the empty chair first, tare it out, then weigh with the patient. Most accurate, needs the patient out of the chair at some point.
• Record the chair's weight on a label on the chair and subtract. Practical for patients with their own chair, but only as good as the label — chairs accumulate bags, cushions and oxygen cylinders.

That last point is the common error. A chair weighed empty in January and carrying a cushion and a bag in June gives a false gain that looks clinical.

Consistency matters more than absolute accuracy

For trend monitoring — fluid balance, nutritional status — what matters most is that the method is the same every time. Same scale, same chair, same clothing assumption, recorded in the notes.

Safety

• Check the stated capacity against the patient plus chair.
• Ramps must be secure and the platform stable before the chair moves.
• Follow your institution's manual handling policy for the transfer itself.

Chair scales are in chair scales; the wider range in medical scales.

This article is part of our guide to Medical Scales: Choosing the Right Scale for Your Practice.