Valx: A System for Extracting and Structuring Numeric Lab Test Comparison Statements from Text.

ABSTRACT:

Objectives

To develop an automated method for extracting and structuring numeric lab test comparison statements from text and evaluate the method using clinical trial eligibility criteria text.

Methods

Leveraging semantic knowledge from the Unified Medical Language System (UMLS) and domain knowledge acquired from the Internet, Valx takes seven steps to extract and normalize numeric lab test expressions: 1) text preprocessing, 2) numeric, unit, and comparison operator extraction, 3) variable identification using hybrid knowledge, 4) variable - numeric association, 5) context-based association filtering, 6) measurement unit normalization, and 7) heuristic rule-based comparison statements verification. Our reference standard was the consensus-based annotation among three raters

SUBMITTER: Hao T 

PROVIDER: S-EPMC5573874 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature