Filtration fraction.........q? - jamebond

[ArchivalUser]

Urine Serum

Creatinine 200.0 mg/dl 2.0 mg/dl
Glucose 0 80.0 mg/dl
Potassium 50.0 mEq/L 5.0 mEq/L
Uric acid 15.0 mg/dl 3.0 mg/dl
PAH 100mg/ml 0.2mg/ml

Which of the following is the best estimate of the filtration fraction in this patient assuming a urine flow of 1.0 ml/mm?

A. 10%
B. 20%
C. 30%
D. 40%
E. 50%

[ArchivalUser]

BB

[ArchivalUser]

B 20%

[ArchivalUser]

FF = GFR/RPF

GFR= (Urine Creatinine/Plasma Creatinine ) X Urine Flow = 200/2 = 100

RPF= (Urine PAH/Plasma PAH) X Urine Flow = 100/0.2 = 500

FF = 100/500 = 0.2 = 20%

[ArchivalUser]

bb

[ArchivalUser]

psychmledr...good explanation
Thx u all...