|From:||"Horn, Hazel V" |
This is from
the March 2003 checklist.............................
This is from the March 2003 checklist.............................
ANP.22570 Phase II N/A YES NO
Are negative controls used for each antibody species?
NOTE: A negative control for each primary antibody species must be used. Alternatively, buffer controls can be used if multiple antibodies for each species are included. The controls used should also control for pre-treatment conditions.
A negative control for each primary antibody species must be used. Alternatively, buffer controls can be used if multiple antibodies for each species are included. The controls used should also control for pre-treatment conditions.
REFERENCE: Weirauch M. Multitissue control block for immunohistochemistry. Lab Med. 1999;30:448-449.
Hazel Horn, HT/HTL (ASCP)
Arkansas Children's Hospital
Phone - 501.364.4240
Fax - 501.364.3912
-----Original Message-----I'm glad that everyone is so concerned with both negative and positive IHC controls. There is certainly more than one side to this issue. I will say that I don't think a positive QC on every slide is absolutely necessary, for many reasons. If the QC is rare & precious, then it is a waste of resources. As is running a negative control for every possible technique permutation on small amounts of tumor. I would rather have slides with tumor left for additional studies than have wasted tumor sections on 4-6 negative controls. You can always evaluate non-specific staining on slides that have had an antibody applied & that are negative with that antibody. The CAP is specific that positive controls be used for each antibody - see CAP checklist ANP.22550. They do not specify for each slide. Since positive QC's should be kept filed for the same number of years as the patient slide & records, it should be possible to pull a QC slide from the IHC run for a particular slide. In the CAP comment on ANP.22550, the use of internal QC's is also mentioned. Although there are many ways of dealing with the issue of QC's, I'm sure we all want to do what is prudent, abide by the regulations, and increase the level of patient care.
From: Patti Loykasek [mailto:email@example.com]
Sent: Monday, October 13, 2003 10:52 AM
Subject: [Histonet] IHC QC's
Just my 2 cents worth.