In the era of CMEs/ BMJ/ CPA etc. and advanced care to all the patients of various levels of health providers like dispensaries/ clinics/ medical centers/ secondary hospitals/ tertiary hospitals, do we have any guideline? If yes, when to refer it?

Asymptomatic patient at first visit to a tertiary care hospital, through ambulances for so-called observation without giving a tablet or secure IV line/fluid at first. What should be the blood pressure reading at clinic or dispensary level?