Never done that. Typically a control (either + or -) will react as it is supposed to, REGARDLESS of its source, which is mostly irrelevant.
As to the rationale of why doing that, you missed the opportunity of asking that to the "pencil/paper pusher" who inspected you!
René J.

--- On Fri, 8/15/08, Tom McNemar  wrote:

From: Tom McNemar 
Subject: [Histonet] Documenting control tissue source?
To: histonet@pathology.swmed.edu
Date: Friday, August 15, 2008, 7:12 AM

We are finishing up our JCAHO inspection today.  The inspector asked about our
control tissues and where we documented the source.  We get nearly all of our
controls from patient samples and she said that most histo labs mark their
control blocks with the source case number.  They then keep records of the
control source used when staining new cases.  I can see no logical reason to
keep this info.  You use a control appropriate for the element being stained. 
Why does it matter where the control came from?  Am I wrong?  Do you do this?  

Thanks.

Tom McNemar, HT(ASCP)
Histology Co-ordinator
Licking Memorial Health Systems
(740) 348-4163
(740) 348-4166
tmcnemar@lmhealth.org
www.LMHealth.org


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