Re: Problems with Processed specimens
From: | "ryandes@esatclear.ie" |
Dear David,
I don't
like the sound of blobs in the wax. This is not xylene as it would
dissolve. It may be alcohol or formalin. Is there any chance someone put
formalin instead of alcohol in the alcohol slot or even in the xylene
slot ? Are the tissues soft and mushy? If so this might be the
case.
Poor
quality formalin would be noticable at the fixation stage, more noticable
in bloody tissues as the red would not go brown. I have had problems with
TBS and they told me I was the only one in the UK, Ireland or Europe who
had a problem with their leaking 2.5 L plastic containers of xylene. Also
I had problems with their neat 40% formaldehyde. The 10% formalin I made
from it formed a gradient in my 25 L drum and by the time we used the
last 10 L it was more alcohol than formalin and the tissues went
clear pink rather than brown. I returned the product to them and never
heard back from them what the problem was. They told me that they have a
QA check on their 10% formalin but not the 40%. The person I spoke with
was from Diachem who supplied TBS. and he was not very nice.
Annette Ryan FAMLS
Histology Lab
Our Lady of Lourdes Hospital
Drogheda
Co Louth
Ireland
At 07:45 PM 9/9/02 +0100, David Muskett wrote:
Dear Histonetters
I am writing to ask for some advice.
We have suddenly started having problems with our
processing. The blocks have become much more difficult to cut. The amount
of nuclear detail is very poor. The nuclei show no chromatin detail and
have a ground glass appearance. The staining is awful and far too
red.
I think the problem relates to the processor, there seems to
be some peculiar blobs in the wax. I think these may be xylene and
alcohol.
There is some suggestion within the department that the
problem may be due to a bad batch of fixative. We are using bought in
filled specimen pots from TBS in the UK. Has anybody in the UK
experienced problems with pre-filled buffered formal saline specimen pots
from TBS.
Does anybody have any answers?
I can send photos to anybody who can offer
help.
Thanks in advance
David Muskett
Alder Hey Children's Hospital
Liverpool, UK
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