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Database lock is the formal closure of a clinical study database after all data cleaning and query resolutions are completed. Once locked, no further changes to the dataset are permitted without formal unlock procedures. A successful database lock is vital for maintaining data integrity, enabling unbiased statistical analyses, and supporting regulatory submissions for product approval.
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The database lock is the formal process of preventing further data entry or modification within the Electronic Data Capture (EDC) system after data cleaning is complete. Once locked, the database is used for final analyses, submission to health authorities, and reporting in Clinical Study Reports (CSRs).
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A soft lock is a temporary restriction applied to the clinical trial database where normal data entry is paused, but specific users such as data managers or medical monitors may still access the data for final review, coding, or sign-offs. It precedes the hard lock, which is the final irreversible lock of the data for analysis.
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Data discrepancies are inconsistencies or anomalies found within or between datasets. They may involve differences between:
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LSLV refers to the date on which the last enrolled trial subject completes their final protocol-scheduled visit. This milestone is tracked closely, as it marks the official end of patient participation and initiates data cleaning, query resolution, and readiness activities for DBL.
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Queries are data clarifications raised by the system or data management personnel when a data point appears incomplete, inconsistent, or outside predefined validation rules. They are raised within the Electronic Data Capture (EDC) system and require action—usually from the investigator site.
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The primary goal of a database lock meeting is to obtain cross-functional agreement that the clinical database is:
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A database lock is the point at which the clinical trial data becomes read-only. No further changes can be made to the data unless the database is unlocked under controlled procedures. This ensures data integrity for statistical analysis and regulatory submission.
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Database lock refers to the process by which all data entries in the Electronic Data Capture (EDC) system are finalized and made read-only. At this stage, no further changes can be made unless the database is unlocked under controlled procedures.
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Once a clinical database is locked—meaning it has been frozen to prevent any further changes—several downstream processes are triggered:
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