United Lincolnshire Hospitals NHS Trust has been asked to make improvements in several areas, including protecting patients from abuse.
The Care Quality Commission (CQC), an independent regulator of health and social care in England, called for the improvements following an unannounced inspection in June.
The health watchdog made the visit to evaluate the trust’s compliance with new quality and care standards, which came into effect on 1 April.
CQC found that the trust did not meet four of these standards: safeguarding people from abuse; respecting and involving people who use services; management of medicines; and supporting workers.
Inspectors were concerned about patients waiting up to four hours in the theatre recovery area, a lack of toilet areas and a lack of training among hospital staff about protecting vulnerable adults.
The CQC said that it will take enforcement action if the trust does not take steps to make improvements.