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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for E.R. fluids 4 letters:

SERA: E.R. fluids
IVBAG: E.R. fluid holder
IVBAG: Pouch of fluid in an E.R.
IVBAG: Fluid-filled pouch in an E.R.