If you are referring to taking medication every 12 hours, I would think "twice a day" or "bidaily" would be sufficient expressions in a medical setting. Some prescribers prefer to write q12h for "every twelve hours."
q 90 min means every one and a half hours.
q stands for quaque, meaning every in Latin. qd is every day, q4h is every four hours, etc.
q2h means every 2 hours.Every 2 hours
The medical abbreviation for every four hours is q4h.q4h
Nothing by mouth every four hours is a rather nonsensical instruction, but if you were inclined to write and abbreviate it, it would be written "NPO q4h."
Take 1 tab po q12 h
3/day or 3xdayThree times daily is abbreviated TID or t.i.d.
Q4h (Every four hours) which would be six times per day.
every four hours
Passes every minute, 60 minutes in an hour, 24 hours in a day so, 60x24 = 1440 It passes the twelve 1440 times in 24 hours.
Twelve hours
The duration of Twelve Crowded Hours is 1.07 hours.