термин, по-моему, можно так перевести.
Предлог "during" часто употребляется с "chart abstraction". Но Игорь прав, в предложении какая-та неувязка (или нужен более широкий контекст, чтобы его правильно понять).

http://www.outcome.com/data-chart-abstraction.htm
Chart Abstraction
Our abstraction teams are highly professional and consider site satisfaction a key component of each site visit. We offer full management services, beginning with hiring a team with subject matter expertise and training the chart abstractors on how to visit sites, review charts, and enter data according to the study protocol.

http://www.medassurant.com/chart-abstractions.aspx
Across industries, the medical chart acts as the primary source and final arbiter of care delivered, patient current health status, efficacy of treatment, and physician quality standards. Leveraging its deep clinical expertise and highly flexible technology infrastructure, MedAssurant delivers a diverse array of Custom Chart Abstraction studies.
/.../Furthermore, chart abstraction results, along with substantiating digitally scanned medical record documentation and project management tracking, are available for all reviews and projects -- often in a nearly real-time fashion. Resulting data is provided directly as well as through a series of pre-analysis reports, aiding in project transparency, removing any need for data re-entry, and facilitating concise project management.

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Note added at 59 mins (2011-07-06 11:33:10 GMT)
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http://www.thefreelibrary.com/Age-related underutilization o...
The diagnosis of heart failure was verified during chart abstraction and later confirmed using diagnostic criteria described elsewhere.