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Filtration Fraction, FF = GFR/RPF, or .
GFR on its own is the most common and important measure of renal function. However, in conditions such as renal artery stenosis, blood flow to the kidneys is reduced. Filtration fraction must therefore be increased in order to perform the normal functions of the kidney. Loop diuretics and thiazide diuretics decrease filtration fraction.
Severe haemorrhage will also result in an increased filtration fraction.