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Quality Experts
@quality-experts
Trusted Member
Joined: Apr 15, 2025
Last seen: Apr 17, 2026
Topics: 0 / Replies: 75
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RE: Determining optimal replicates for cell-based assay validation

It's possible to compute the intermediate precision (IP) or total analytical error (TAE) for a reportable value computed from replicates. Hence, if on...

4 months ago
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RE: Statistical Tools & Software for Analytical Development

The equivalence test TOTS is included in minitab from version 17. Join Dr Francisca Galindo Garre from Johnson & Johnson Innovative Medicine...

9 months ago
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RE: Method Comparability and Statistics for Analytical Development

The criterium 3 SD is commonly used for Bland-Altman plot. Note that this criterion should include 99.99% of differences. It is also important to chec...

9 months ago
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RE: Equivalence Testing

To set equivalence limits we should take into account which differences are scientifically relevant and also the variation of the methods that we are ...

9 months ago
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RE: Bridging of methods or critical materials

Generally, I think it is essential to distinguish a method bridging from an instrument change. For method bridging (moving from one analytical method ...

9 months ago
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RE: Vendor support when updating analytical procedures

The interest by manufacturers to support users is very well appreciated. I think first of all an active exchange is beneficial in all cases. Generally...

9 months ago
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RE: Instruments updates and method validation

ICH Q2R2 chapter 2.2 offers three scenarios that depend on the degree of performance differences between the two instruments. In case the readout is c...

9 months ago
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RE: Established conditions CGT

The use of EC, or rather avoiding that the ECs are not too extensive, is not related to the modality, I think, but rather the amount of knowledge. It ...

9 months ago
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RE: Enhanced Approach and ICH Q14

The cornerstone of the whole approach is the ATP. If priority has to be given to a "part", then definitely the ATP. The ATP alone is not enough for th...

9 months ago
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RE: Control Strategy

Chronologically speaking, the validation is performed first (and it is recommended to include such a control as part of the validation), then the tren...

9 months ago
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RE: Robustness

I fear that we might have a too statistical view of robustness, especially for early phases. Robustness data might be the voice of the customer (does ...

9 months ago
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RE: ATP and filings

Not currently, but it is our goal for our next filings to better justify that certain CQAs, when controlled by an analytical procedure, are correctly ...

10 months ago
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RE: Method Operable Design Region (MODR)

I do not think that MODR (except in exceptional cases) has much added value. As correctly stated in the question, the cost of establishing an MODR req...

10 months ago
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RE: ICH Q14: software-assisted method development

Yes, I think that the enhanced approach is an incentive to use software-assisted method development. Pieces of software are already used to automate, ...

10 months ago
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RE: Forced degradation testing

I have no experience with CAR and ELISA assay forced degradation. Available guidance, such as the Brazilian ANVISA, Guideline No. 04/2015 focus on che...

10 months ago
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