Re: [Histonet] uneven sections on slides

From:Jennifer MacDonald

Multi levels of focus can also be attributed to sections that are too 

Jennifer MacDonald 
Sent by:
03/17/2005 08:54 AM


Re: [Histonet] uneven sections on slides

In a message dated 3/17/2005 9:25:56 AM US Mountain Standard Time, writes:

> In the past few days one our pathologists has been complaining about 
> "uneven
> sections."  In other words, he's having to focus up and down a lot 
> the sections aren't flat on the slide. 


It sounds to me like the problem may lie in the microtome.  It could be a 
type of "chatter" in the sections.  They may indeed not be flat on the 
slide, or 
they could be of uneven thickness.

This is almost always because something is loose on the microtome, such as 

the specimen clamp or something in the knife holder, and the main offender 
usually the knife holder.

A quick check would be to cut the same block on different microtomes, then 

ask the doc to evaluate the sections.  See if you can pinpoint the problem 
to a 
specific instrument. 

If you find you have a problem with one microtome, be sure to check out 
knife holder and the clamping mechanism for the blade.  It could be 
as simple as paraffin debris in the blade clamping mechanism, or maybe the 

clamping pressure needs to be adjusted or the mechanism's springs need to 

Just my two cents' worth.  Hope it helps!



Robert (Bob) Chiovetti, Ph.D.
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