Concerns over legionella, disposing of needles and storage of linen were also a concern to inspectors who carried out an unannounced follow-up visit to the Western Infimary in August.
The inspectors issued five requirements and three recommendations for the city's health board to act on to address the concerns.
Inspectors found the standard of cleanliness was generally good and staff were aware of the correct procedures.
However, they highlighted areas for improvement, including ensuring sharps bins (for needles) were properly closed and the hospital was to ensure a legionella and effective water management policy is in place.
Inspectors found isolation room doors left open when they should be closed unless a risk assessment is documented in the patient's notes.
Rory Farrelly, NHS Greater Glasgow and Clyde's acute director of nursing, said: "We are disappointed some areas are still falling short of the standards expected in all our hospitals."