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Sending Specimen
Sending Specimens


Mail In Services:

Drop Off Services:


  • Fix specimens for a minimum of 12-24 hours (time depending on size of specimen) before shipping; it is recommended to ship the sample in a smaller volume of neutral buffered formalin once adequately fixed. Mass Histology does not recommend transfer of specimens into 70% alcohol.

  • Ship the specimen in a leak-proof container with secondary containment and absorbent material to prevent any leakage of formalin.

  • Ensure a signed SOW and specimen manifest accompanies your shipment or is provided via e-mail prior to receipt of your project. Any additional instructions not captured on the existing SOW can be included in the shipment.

Sending Your Cassettes

If you send us cassettes, please follow these few simple requirements:


Mass Histology Service is only responsible for labeling the microscope slide with the information legibly written on the cassette: Cassettes are batch processed in groups of 300 every night.  We are not responsible for any identification information written on the containers in which the cassettes are sent to us in. Please have each cassette identified with the experiment number, animal number and tissue (or variable) code. We will only label the slide with the information that is written on the cassette.

Mass Histology Service will not be responsible for cleaning paraffin blocks sent to them: If we have to clean received paraffin blocks (scrape excess paraffin from them), there will be a $1.00 surcharge per block

Mass Histology Service will not be held responsible for poorly processed tissue submitted to us as paraffin blocks: We will do our best to section paraffin blocks prepared by others but we cannot guarantee perfect sections if we did not process the tissue.

Mass Histology Service will not be responsible for the labeling of cassettes sent to us:  If we cannot read the markings on received cassettes due to illegible writing or if the ink washes off during processing, we will contact you and inform you of the situation. If the situation is noticed after tissue processing, the client is still responsible for paying for processing.

Mass Histology Service is not responsible for any unpredicted end result: If any "untried" tissue, material or antibody is submitted to Mass Histology Service for "R&D" (Research And Development) workup, the client is responsible for paying us for our time and efforts, even if the results are not in the client's favor.

Specimen size:  If you are sending us specimens in a cassette, we will not be responsible if the tissues were too large to process on our routine processing cycle. What is the correct size to submit for routine processing? This is what I learned many years ago and it still holds true:  If the tissue touches the sides of the cassette, it's too large and if the tissue touches the lid, it's too thick! Simple! Processing chemicals have to be able to enter the cassettes and surround the tissue to properly do their job.