Does anyone in their Blood Management, Blood Conservation, Bloodless program have color bracelets and color dots to identify 'NO Blood' patients? Likewise to identify provisional patients?

My understanding is hospitals are moving towards national colors.

I.E.. Green (DNR), RED (Drug Allergies), Latex Allergy (Lavender), Falls Precaution (Yellow)

I visited a nearby hospital and they have the colored dot to represent the "No Blood" patient. Incidentally they do not have a Blood Management/Bloodless program.

What are the pros and cons? In your expertise.