Final answer:
An Out sheet is used to track a patient's chart that has been removed from the storage area, by indicating this removal and providing details about the borrower and the date of removal.
Step-by-step explanation:
The filing tool used to track a patient's chart when it is removed from the storage area is an Out sheet. When a chart is taken out, the Out sheet is placed in the chart's location in the filing system to signify that the chart has been borrowed. This sheet contains information such as the patient's name, chart number, the date the chart was removed, and the name of the person who took it. The use of Out sheets ensures that there is a system in place to track the whereabouts of patient charts and facilitates the fast retrieval or return of the charts.