What is the optimal cutting temperature on a cryostat for cellular tissues such as brain, kidney, liver, spleen, uterine curettings, and thyroid?

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The key idea is choosing a cryostat temperature that freezes tissue enough to cut cleanly without making it too brittle or causing ice crystal damage. For soft, cellular tissues like brain, kidney, liver, spleen, uterine curettings, and thyroid, a moderate cold—around -15 to -5°C—provides the best balance. At this range the tissue block is firm enough to produce thin, intact sections with smooth knife travel, yet not so cold that it becomes brittle and cracks or shatters. If you go much colder, such as -25 to -15°C, the tissue can become brittle and edges may crumble. If it’s warmer, from 0 to 5°C or near 0°C, the tissue can thaw slightly and smear or distort during sectioning. This middle ground helps preserve cellular details while allowing reliable microtomy for these tissues.