Times
Body Part
Symbols
Times a day
Miscellaneous
100

Every hour

What is QH?

100

Right eye

What is OD?

100

Less than

What is <?

100

Twice Daily

What is BID?

100

Toenail trim

What is TNT?

200

Every two hours

What is Q2H?

200

Left eye

What is OL?

200

Greater than

What is >?

200

Four times a day

What is QID?

200

Urinalysis

What is UA?

300

As necessary

What is PRN?

300

Both eyes

What is OU?

300

Percent

What is %?

300

Three times a day

What is TID?

300

Ointment

What is UNG?

400

Every 6 hours

What is Q6H?

400

Left ear

What is AL?

400

Approximately

What is ~?

400

Every other day

What is QOD?

400

Hematocrit

What is HCT?

500

Freely as wanted 

What is AD LIB?

500

Right ear

What is AD?

500

Equals

What is =?

500

Once a day

What is SID?

500

Orally, by mouth

What is PER OS?