A new analysis of 510(k) premarket review timeframes by the US Food and Drug Administration cites response times from companies to additional information requests as the key causes of review delays. Overall, the FDA study found that between 2001 and 2010, percentages of 510(k) submissions that prompted Additional Information (AI) requests increased steadily and substantially—from 38% in 2001 to 77% in 2010. Average 510(k) decision time frames during that same period followed a similar trajectory, particularly from 2005 onward: In 2001, 510(k) decisions took an average of 102 days to reach, and in 2010 that average increased to 140 days. (These numbers track closely to a recent analysis of 510(k) clearance timeframes conducted by Emergo.)