they use Ringer’s solution for IV fluid:
Ringer’s solution, also known as Lactated Ringer’s or Hartmann’s solution, is a balanced crystalloid solution used for fluid and electrolyte replacement. It contains various salts like sodium, potassium, calcium, and chloride, and sometimes lactate. It is used to restore blood volume, treat dehydration, and correct electrolyte imbalances, particularly in situations like blood loss, burns, and certain medical conditions.
They use both, depending on the patient's condition.
"Ringer's" is mostly NaCl.
BTW: Most Americans are Potassium deficient. It’s also an important electrolyte.
You can check out the RDA and it’s measured in grams. (like 3-4)
How do you get enough of it? Lots of the right fruits and vegetables....or you can get KCl...AKA “salt substitute”.