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Jan 20, 2018 · CGA (Chromogranin) results from different labs in Neuroendocrine Tumors (NETs)

I don’t know the answer to that question but any respected lab needs to follow certain procedures and certifications to ensure quality control. If you question the validity of a test result, the test should either be repeated at that time or in a couple of weeks to a month. For pancreastatin and Neurokinin A, ISI is the place to have it sent out to. Other carcinoid testing can be sent elsewhere, just try to have it done consistently at the same lab.

Jan 20, 2018 · CGA (Chromogranin) results from different labs in Neuroendocrine Tumors (NETs)

Tom, I’m not sure what you mean by “CgA results can vary from lab to lab”. However, different labs perform different tests to measure for CgA; consequently, they have different reference ranges for what is normal. Normal range at Mayo’s lab is less than 93 (but back in 2010 when I first had this test done at Mayo normal was less than 225…not sure when they changed to a different method of testing) University of Iowa sends theirs to ARUP with a normal range of 0-95, my local oncologist sends to Quest whose normal is 1.9-15.0. If theCgA is performed by different labs which use different methods of testing it’s like comparing apples and oranges. Bottom line is know what the normal range is and that will determine if you can compare results. Hope this makes sense.