Although the context can sometimes clarify which letter or numeral is meant, it can also detract from recognition. Information that contains both numerals and letters-including e-mail addresses or medication orders-is particularly easy to misread. Most of us know how easy it is to misidentify a computer-generated lower-case letter l in an e-mail address as the numeral 1 or the letter O as a numeral 0. For example, a clearly typed prescription for 25 mcg of LEVOXYL (levothyroxine) could be misread as 125 mcg if the name appears without proper spacing as “Levoxyl25 mcg,” especially since both dosage strengths are available for this drug. Although the use of these technologies is growing, even typewritten or computer-generated physician orders might not prevent confusion with certain alphanumeric symbols. ![]() Electronic medical records, medication administration records (MARs), and computerized prescriber order entry (CPOE) systems can help minimize many problems with handwritten information.
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