I have not been in any part of the lab but microbiology since 1988. However, 
I think you must keep track of lot numbers, outdates, received dates. You 
must keep good records. If you're still on paper, your worksheets must 
reflect these lot numbers and their results.  I think you have to cross 
reference controls from old kits to new somehow.

Can someone else with more recent experience doing this type of QC testing 
please comment? QC in micro is really a different deal entirely than with 
immunology.

Judy Dilworth, M.T. (ASCP)
Microbiology

"nusaiba" <nusaibaqayed@yahoo.com> wrote in message 
news:1170006811.913657.264380@a75g2000cwd.googlegroups.com...
> We do have negative and positive controls and we do not give out
> results without the controls.  However, what I meant is that are
> charts suitable to measure its effectivness? Because someone (who is
> American) from the Americal Hospital that we have in Dubai once told
> me that if you are doing screening then you only to check your
> negative and positive controls.  Is this true? or is it more effective
> to have charts?