Question

If the GFR is 140 ml/min and the filtration fraction is 20%, then the renal plasma flow (RPF) is _______ ml/min.

• A. 650
• B. 700
• C. 600
• D. 2800

Answer 1

The correct option is B 700

GFR or Glomerular filtration rate is the amount of filtrate formed by kidneys per minute.

RPF or Renal plasma flow is the amount of blood plasma that is delivered to kidneys.

Filtration fraction or FF is the ratio of GFR to RPF.

Therefore, FF = GFR/RPF

In the given question, GFR = 140 ml/min and FF= 20 % or 0.20

Putting the values in the formula,

0.20 = 140/RPF

RPF = 140/0.20 = 700

So, the correct answer is '700'.