Which Ear Is OD?
Which Ear Is OD? Abbreviations Intended Meaning Misinterpretation μg Microgram Mistaken as “mg” AD, AS, AU Right ear, left ear, each ear Mistaken as OD, OS, OU (right eye, left eye, each eye) OD, OS, OU Right eye, left eye, each eye Mistaken as AD, AS, AU (right ear, left ear, each ear) BT Bedtime