SitByCare On-Call is a service that quickly connects patients and companion seekers with a health sitter. Patients & their families use this service if they are looking for a sitter for the same day. Patients can select Immediate availability through a search by putting in their zip code. Sitters can mark themselves On-Call through their calendars and be available for any requests received for the same day. Generally, On-Call rates are higher than the average week-day rates.