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How do you freeze tissue in October?

4 min read

Asked by: Dulce Ramirez

Put 2 drops of OCT into a plastic cryomolds. Place tissue on top in correct orientation for cutting. Carefully pour OCT on top of tissue, being careful to avoid bubbles until none of the tissue remains exposed. Place the mold on top of the aluminum plate on the dry ice for rapid freezing.

Can you embed frozen tissue in Oct?

Now we can oct embed the frozen. Tissue. Using pre-cooled forceps immediately place the frozen tissue into the oct covering any exposed surfaces with additional oct confirm there are no bubbles.

How do you store embedded tissue in October?

Answer: There are two options to fresh freeze and embed your tissue in OCT in preparation for running Visium.

  1. Snap freeze the tissue and store it in a sealed container at -80C. …
  2. Simultaneously freeze and embed tissues in OCT and store in a sealed container at -80C until ready to section.

How do you freeze fresh tissue?


  1. Remove desired tissue and place in cold PBS and wash out blood.
  2. Place tissue into fixative and fix for 2-4 hours or overnight depend on the tissue sizes.
  3. Wash with cold PBS 1 min.
  4. Wash with PBS 10 or 20 min X3.

How do you make a frozen tissue section?

There are a couple of specimens over on the left hand side there one of which is already prepared in our plastic embedding medium. And then a fresh piece of tissue there as well. So the first approach

How do you send a frozen specimen?

Place the specimen box into a ziplock bag and seal the bag. Place the ziplock bag in the bottom of the shipping box. If necessary, use sheets of bubble wrap to ensure specimens remain in a vertical position. Fill a Styrofoam-lined shipping box with dry ice.

Can you snap freeze with dry ice?

Snap freezing is the technique in which a sample is rapidly frozen using dry ice, a dry ice/alcohol slurry or liquid nitrogen. Snap freezing reduces the chance of water present in the sample forming ice crystals during the freezing process, and better maintains the integrity of the sample.

How long can tissue stay in Oct?

All Answers (1) Once you embed the fresh tissue samples in OCT, you can store it at a temperature of -80 C for preservation over a long period of time. In my experience, the samples stayed preserved for 3 months. It can potentially be stored for a longer duration than that.

Where do you store OCT blocks?


The frozen blocks can be temporary stored in dry ice. Transfer the blocks to a liquid nitrogen storage tank (Years) or -80°C freezer (Months).

Can you fix frozen tissue?

Fix the tissue sections with a suitable fixative. One of the commonly used fixation methods for frozen tissue sections is to immerse the slides in pre-cooled acetone (-20°C) for 10 min. Pour off the fixative and allow acetone to evaporate from the tissue sections for < 20 min at room temperature.

What are the other methods used to freeze tissues in frozen section?

At pathology institutes with higher work loads, solid carbon dioxide, freezing sprays, and cryostat freezing are commonly used as coolants for diagnosing frozen tissue sections, whereas for tissue banking, liquid nitrogen or isopentane cooled with liquid nitrogen is preferred.

How do you freeze tissue with dry ice?

Freezing methods

One simple method is to use dry ice (-70C) in block form placed in a styrofoam container. Place the filled cryomold on the block to freeze it. This method has the advantages of simplicity and safety, but does not freeze the tissue as rapidly as immersion in a freezing medium.

How accurate is frozen section?

Results. The overall rate of frozen section accuracy was 97.8 %.

What are the two methods of preparing frozen section?

Fresh tissue freezing – The tissue is placed in OCT and flash frozen. 4% Paraformaldehyde (PFA) – This method uses 4% PFA and sucrose as a cryo-protectant. The tissue is placed in OCT and frozen using dry ice or flash frozen. Enzyme study – This method is often used for fresh muscle tissue.

What is tissue freezing?

Freezing tissues slowly allows the water molecules to line up during the transition and form crystals, which results in volume expansion with destruction of cell membranes and holes in loose connective tissue. Liquid nitrogen (-190oC) is frequently used for rapid (flash) freezing.