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# Top FDA-483, Warning Letter Observations
- URL: https://www.fdaweb.com/top-fda-483-warning-letter-observations/
- Published: 2022-09-15T12:00:00.000Z
- Updated: 2026-09-14T17:59:31.000Z
- Author: David McFarland
- Tags: Devices, #legacy-id-D5152751

A MasterControl white paper analyzed medical device data from 2017 through 2019 to determine the most common FDA observations that lead to a form FDA-483 or Warning Letter. The [paper](https://www.mastercontrol.com/library/white-papers/most-common-reasons-for-fda-form-483-observations/?utm%5Fcampaign=7013x0000023a1nAAA&utm%5Fmedium=Email&utm%5Fsource=MC&mkt%5Ftok=MzI3LVlCWC0wMzYAAAGG4L9m8mLc8%5FQeKHQylc4n07KkxiQyzHNxGu-b5O%5FzXzjt%5FdTM8vhg2R1EJXjHc5VNO-cXHlsLoZfuy-iVsA%5FJGYGfxUxxKXYXrxyzPTyzZ2Q%5FFJdMpg) says the most common observations involved these processes:

- corrective and preventive action;
- customer complaints;
- purchasing controls;
- medical device reporting procedures; and
- process validation.

The paper goes into detail with examples of what is involved in each of the processes.