"every 4 hours" is correct and usable in written English.
You can use it to describe a frequency of something happening, such as: "I need to take this medication every 4 hours."
Maternal serum was collected every 4 hours until delivery.
Patients were given 50 μg misoprostol every 4 hours.
The dose was repeated every 4 hours to a maximum of 5 doses if indicated.
Small events occur irregularly but on average about every 4 hours and large events about once a day.
Twenty-five microframisoprostolrostol was administered every 4 hours up to six doses, followed by intravenous oxytocin administration.
Doses were repeated every 4 hours until onset of labor or a maximum of 12 doses were given.
Patients were classified into short and long therapy groups, with interval from first albuterol dose to initiation of administration every 4 hours ≤12 or >12 hours, respectively.
Every 4 hours we index as much information as the entire U.S. Library of conference.
Maximum tolerated dosages for interferon-alpha 2a with zidovudine, respectively, were 4.5 million U/d with 200 mg every 4 hours or 18 million U/d with 100 mg every 4 hours.
As part of the routine MICU respiratory therapy protocol, mechanical ventilation parameters are recorded every 4 hours.
TR was measured every 4 hours as the difference in nonaerated tissue between expiratory and inspiratory CT.
