Winter Specimen Submission
Human tissue and the formalin preservative we provide both contain a large percentage of water. (65% for human tissue and ~90% for the formalin preservative.) When water freezes, it expands. If the specimen is frozen, the water within it expands and creates distortions that alter the structure of the tissue in a way that may impact the pathologist’s ability a give a diagnosis. This is called Freezing Artifact. When temperatures are below freezing, we recommend taking the following steps to avoid Freezing Artifact.
Steps to Avoid Freezing Artifact:
- Perform the biopsy as normal and place the specimen in the provided formalin container. (Ensure the container is fully labeled with 2 patient identifiers.)
- Let the specimen sit in the formalin for a minimum of 8 hours. We recommend overnight. For larger specimens (>1cm) or cystic specimens you may want to consider 12 hours.
- The next day – fill the formalin container to the top with 70% Ethyl Alcohol. If needed you can decant a small amount of the formalin. Higher percentages of alcohol are acceptable. Isopropyl alcohol is also ok – but ethyl alcohol is preferred.
- Carefully place the lid back on the formalin container. Alcohol dissolves ink so care should be taken to avoid spillage.
- Package and mail the specimen as normal!