Flashcards in Quantitative Renal Physiology or Evaluation of Renal Function Deck (11):
What is the equation for mass flow?
Mass Flow = Concentration x Volume Flow
What are the routes of flow in the kidney?
Input - renal artery
Output - urine, renal vein, lymphatics
What is the equation for filtration rate?
Filtration Rate = GFR x Px
What is the equation for excretion rate?
Excretion Rate = UF x Ux
What substance is used as a model to measure kidney function?
Inulin (not produced in body, not metabolized, excreted only by kidney)
What is the equation for plasma inulin concentration?
P in = Infusion rate / Output rate
What is the equation that relates GFR and inulin?
GFR = UF x U in / P in
Volume of plasma that is completely cleared of a substance by the kidneys per unit time.
What is the equation for extraction ratio?
Ex Ratio = (Ax - Vx) / Ax
Ax = arterial [ ]
Vx = renal venous [ ]
What substance do we use to calculate effective renal plasma flow and what is the equation?
C pah = (UF x U pah) / P pah