Sheath size

What does "Sheath size" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.

Explanation

Sheath size in medicine refers to the diameter of a tube-like instrument, known as a sheath, used in various medical procedures. This sheath is often inserted into the body to allow doctors to perform certain procedures or tests without making large incisions. The size of the sheath is important because it needs to be large enough to accommodate other medical instruments, but small enough to minimize discomfort and potential damage to the body. The size is typically measured in French units, where one French equals one-third of a millimeter.

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