Hi Ashley

This is surely a deep subject on external lab results and trusting the results.  There are a lot of steps to choosing a lab to do your testing where you know what requirements you need to suit your needs.  Detection limit, uncertainty, precision, specificity from interferences.  You can find out if the lab is accredited to perform the tests.  You can include double blind samples and blanks, split samples, and other methods to provide evidence they get the answer right.  The testing should be done using validated methods, competent personnel, include appropriate internal quality control and you can supplement the quality control samples with your own qc samples.  If you do that you should establish acceptance criteria for the sample set.  If they dont get the blanks and qc’s right you probably are not going to accept the results as fit for use.   If they say everything is good and your blind qc samples, split samples, blanks don’t make sense well you can check out what is going on.  You have to establish the criteria for which those tests should be accepted or rejected.

This can fill a lot of space.

Sam 

On Apr 24, 2023, at 5:51 PM, Robert H. Hill, Jr. <roberth_hill**At_Symbol_Here**MINDSPRING.COM> wrote:

Many years ago when I was in this kind of business, we wanted to know their quality control procedures and the results for the runs that included our samples.  These labs should have established quality control limits and their quality control samples were required to fall within those restrictive limits.  There are rules about doing this.  Hope this helps.  Thanks. Bob Hill

 

 

Robert H. Hill, Jr., Ph.D.

Stone Mountain, GA 30087

roberth_hill**At_Symbol_Here**mindspring.com

 

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-----Original Message-----
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Sent: Apr 24, 2023 5:24 PM
To: <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Subject: [DCHAS-L] Quality check for external lab reports

 

 

What would you recommend a customer look for in a lab report so they know they can trust the results? 

 

Thank you,

Ashley

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