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Updated June 30, 2014

Written or reviewed by a board-certified physician. See About.com's Medical Review Board.

Definition: A medical acronym for 'no known allergies," NKA is used in medical records to notate that a patient does not have any known allergies. NKDA is also commonly used. It stands for "no-known drug allergies."
On the patient's chart, NKA was written under the medications section.

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