Discontinued abbreviation: AD

mistaken for AS, AU, OD, OS, OU

Discontinued abbreviation: AS

mistaken for AD, AU, OD, OS, OU

Discontinued abbreviation: AU

mistaken for U (units)

Discontinued abbreviation: cc

mistaken for U (units)

Discontinued abbreviation: dc, DC, D/C

mistaken for each other (discharge/discontinue)

Discontinued abbreviation: IU

mistaken for IV

Discontinued abbreviation: MgSO₄

mistaken for MSO₄

Discontinued abbreviation: MS, MSO₄

mistaken for MgSO₄

Discontinued abbreviation: OD

Mistaken for AD, AS, AU, OS, OU

Discontinued abbreviation: OS

Mistaken for AD, AS, AU, OD, OU

Discontinued abbreviation: OU

Mistaken for AD, AS, AU, OD, OS

Discontinued abbreviation: qd

Mistaken for: qod

Discontinued abbreviation: qod

Mistaken for: qd, qid

Discontinued abbreviation: SC, SQ

Mistaken for: SL or 5 every...

Discontinued abbreviation: SS

Mistaken for: 55

Discontinued abbreviation: u

Mistaken for: 0, 4 or cc

Discontinued abbreviation: μg

Mistaken for: mg

Discontinued abbreviation: ‹ (less than) or › (greater than)

Mistaken for each other (less than or greater than)

Discontinued abbreviation: decimal point following number (eg 4.0 or 51.0)

Mistaken for 40 or 510

Discontinued abbreviation: starting a number with a decimal point (eg .41 or .5)

Mistaken for 41 or 5