How often are Doctor s offices required to have their scales calibrated?

Here, annually, along with all the rest of our equipment including BP machines, thermometers, ECG machine and spirometer. The calibration company puts a PASSED sticker on the device.

We had ours calibrated yearly, but I don t think it is a requirement. I bought two scales from a defunct weight clinic in 1975. They lasted 35 years and were never off by more than a pound.

Not required at all by law.