Are 10 week old samples in formalin still usable?

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5 years ago

Ercole Udinesi

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Are 10 week old samples in formalin still usable?

I have left my tumor samples in formalin for an extended period of time (around 10 weeks). Do you think I will be able to use them for TUNEL assay and get results? Thank you for your help in advance

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**Dr. Saritha Adepu** · Answer 1 · 2019-05-21T09:14:48+00:00

Tissue that has been formalin fixed can last for a very long time. The only thing you should be careful at this point is antigen retrieval. I would recommend you to use Tris-EDTA pH 9 for that.