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"Normal Saline" is 0.9% salt in water. This is also known as Isotonic Saline, and it contains the same percentage of salt as is normally found in the human body. The taste of tears are a good way of understanding Isotonic or Normal Saline.

Half Normal Saline is 0.45% saline in water, and is called Hypotonic Saline. It is dangerous to give this in an IV unless prescribed by a physician after consulting laboratory tests on the patient. This is due to its osmolality.

Formal Saline, or Formalin, is 10% salt in water. It is used to preserve lab specimens and in embalming bodies. Formalin is an extremely toxic chemical, and ordinary people should not come into contact with it.

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15y ago

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