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NegEx

NegEx locates trigger terms indicating a clinical condition is negated or possible and determines which text falls within the scope of the trigger terms.

Input: a sentence with optionally indicated clinical conditions from the sentence.

Action: determine the scope of any trigger terms in the sentence.

Output: two types of output:

(1) value of indexed conditions - if you indicate the conditions whose negation status you are wondering about, NegEx will return negated or possible for those conditions within the scope of negation terms (no value is returned for the conditions if the condition is considered present);

(2) the text within the scope of a trigger term - this is a more generalized output without needing to predetermine conditions of interest.

Papers evaluating NegEx

• Chapman WW, Bridewell W, Hanbury P, Cooper GF, Buchanan BG. A simple algorithm for identifying negated findings and diseases in discharge summaries. J Biomed Inform. 2001;34:301-10.
• Goldin I, Chapman WW. Learning to detect negation with `not' in medical texts. Proc ACM: SIGIR 2003.

Papers applying NegEx

• Chapman WW, Bridewell W, Hanbury P, Cooper GF, Buchanan B. Evaluation of negation phrases in narrative clinical reports. Proc AMIA Symp. 2001;:105-9.