Therapath put out this PR a couple of days ago:

http://www.prnewswire.com/news-relea...300206822.html

If I'm reading it right, skin biopsy results can be skewed if they are not kept cold enough when "preserved" in one of two common substances (fixatives) used for transport to Therapath.

If you look at their website, there's big reason hospitals/doctors might use the fixative that is subject to error prone results if not kept cold:

1. The shelf life of the problematic one is a year, while the shelf life of better option is only 4 weeks.
2. The better one must be kept refrigerated until used, while the other one can be stored at room temperature.

https://www.therapath.com/fixative

So if you get a biopsy, it sounds like you might want to request the PLP fixative...if it's even an option. Obviously there are reasons hospitals would only offer the Zamboni fixative.