Renal blood flow

Renal blood flow
MeSHD012079

In renal physiology, renal blood flow (RBF) is the volume of blood delivered to the kidneys per unit time. In humans, the kidneys together receive roughly 20 - 25% of cardiac output, amounting to 1.2 - 1.3 L/min in a healthy adult.[1] It passes about 94% to the cortex. RBF is closely related to renal plasma flow (RPF), which is the volume of blood plasma delivered to the kidneys per unit time.

Parameter Value
renal blood flow RBF = 1000 mL/min
hematocrit HCT = 40%
glomerular filtration rate GFR = 120 mL/min
renal plasma flow RPF = 600 mL/min
filtration fraction FF = 20%
urine flow rate V = 1 mL/min
Sodium Inulin Creatinine PAH
SNa = 150 mEq/L SIn = 1 mg/mL SCr = 0.01 mg/mL SPAH =
UNa = 710 mEq/L UIn = 150 mg/mL UCr = 1.25 mg/mL UPAH =
CNa = 5 mL/min CIn = 150 mL/min CCr = 125 mL/min CPAH = 420 mL/min
ER = 90%
ERPF = 540 mL/min

While the terms generally apply to arterial blood delivered to the kidneys, both RBF and RPF can be used to quantify the volume of venous blood exiting the kidneys per unit time. In this context, the terms are commonly given subscripts to refer to arterial or venous blood or plasma flow, as in RBFa, RBFv, RPFa, and RPFv. Physiologically, however, the differences in these values are negligible so that arterial flow and venous flow are often assumed equal.

  1. ^ Kaufman, Daniel P.; Basit, Hajira; Knohl, Stephen J. (2024), "Physiology, Glomerular Filtration Rate", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID 29763208, retrieved 2024-10-29