腎臟血流量(Renal blood flow, RBF)

（腎動脈壓力-腎靜脈壓力）/總腎血管阻力，以下推導
腎臟有其調控機制，以維持RBF和GFR相對恆定，在80~160毫米汞柱之間的動脈壓力範圍都能穩定調控

資料來源：quizlet

Renal plasma flow is the volume of plasma that reaches the kidneys per unit time. Renal plasma flow is given by the Fick principle:

This is essentially a conservation of mass equation which balances the renal inputs (the renal artery) and the renal outputs (the renal vein and ureter). Put simply, a non-metabolizable solute entering the kidney via the renal artery has two points of exit, the renal vein and the ureter. The mass entering through the artery per unit time must equal the mass exiting through the vein and ureter per unit time:

where P_a is the arterial plasma concentration of the substance, P_v is its venous plasma concentration, U_x is its urine concentration, and V is the urine flow rate. The product of flow and concentration gives mass per unit time.

As mentioned previously, the difference between arterial and venous blood flow is negligible, so RPF_a is assumed to be equal to RPF_v, thus

Rearranging yields the previous equation for RPF:

資料來源：維基百科

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