Medical term:

fen



fen

a plant community on alkaline, neutral or slightly acid peat that is wet and usually low-lying.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


fractional excretion of sodium

The urinary sodium concentration multiplied by the plasma creatinine concentration multiplied by 100, all divided by the product of the plasma sodium concentration and the urinary creatinine concentration.
Medical Dictionary, © 2009 Farlex and Partners


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