post https://sandbox.elationemr.com/api/2.0/vitals/
Things to note:
All units are based on the standard units Elation uses (see Vital Object).
Blood Pressure is the only field that accepts multiple items.
Vitals can only be added to unsigned visit notes.
If a visit note is not specified. Elation will create a new unsigned visit note and add the vitals to that new note. If the patient has an appointment for the day, the new visit note's chart date will be set to the appointment time.