Starting Wednesday, a new state law requires Connecticut hospitals to tell all patients when they are being kept in the hospital for observation instead of being admitted and to warn them about the financial consequences. Anyone who goes to the hospital can be placed on observation status, so that doctors can determine what’s wrong, and decide whether the patient is sick enough to be admitted or well enough to go home. Observation patients may receive diagnostic tests, medications, some treatment, and other outpatient services. Depending on their insurance, they can be charged a share of the cost. “They are in a regular hospital bed in a hospital room, getting a hospital level of care, and they have no way of knowing they were not admitted,” said Rep. Susan Johnson, a sponsor of the legislation and co-chair of the General Assembly’s Public Health Committee.