Weight/Height units

I got EHR and FHIR Server setup in my NextCloud instance.
I saw that Patient weight is entered in kg and height in cm.
Can this be changed?
If I get my medical records from my doctor’s office, would they also be in kg/cm?

And as far as the request for medical records, I guess that’s only valid in Germany? I don’t think my American Doctor would be impressed by the Berufsordnung der Ärztekammern