Difference Between Out of Specification and Out of Trend : Pharmaceutical Guidelines

Difference Between Out of Specification and Out of Trend

Out of specification and out of trend are different concepts used in pharmaceuticals. Difference between OOT and OOS is explained here.
1. OOS (out of specification) is the comparison of one result versus a predetermined specification criteria while OOT (Out of Trend) is the comparison of many historical data values versus time.

2. OOS investigations focus on determining the truth about that one value while OOT investigations focus on understanding non-random changes.
The specification limit for assay is: 95.0-105.0 % w/w of label claim

Case-1: For a particular batch, the result obtained 94.2 % w/w -This result is out of the specification limit. This is called OOS.

Case-2: The result obtained 95.8 % w/w. Although the results are well within the specifications, we should compare the result with the previous batches trend. If we found the average value of the trend as 99.0 % w/w then this batch result (95.8 % w/w) is called out of trend.

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Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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6 comments: Post Yours! Read Comment Policy ▼

  1. Nimesh Trivedi25/8/13 17:27

    how to prepare OOT SOP

  2. how i can make a report of OOT

  3. how far is it from trend average to be concluded as OOT? 5%? 10%? thanks.




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