Urine flow rate

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Parameter Value
renal blood flow RBF=1000 ml/min
hematocrit HCT=40%
renal plasma flow RPF=600 ml/min
filtration fraction FF=20%
glomerular filtration rate GFR=120 ml/min
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
ERPF=540 ml/min

Urine flow rate (or urinary flow rate) is a measure of the quantity of urine excreted in a specified period of time. Common periods of time used include "minute" and "seconds."

The letters "V" (for volume) and "Q" are both used as a symbol for urine flow rate.

It can be estimated by uroflowmetry (or "uroflow"), which is performed by urinating into a special urinal or toilet that has a measuring device.[1] The average rate changes with age.[1]

Clinical Usage[edit]

Changes in the Urine Flow Rate can be indicative of kidney or other renal disorders. Similarly, by measuring urine flow rate, it is possible to calculate the clearance of metabolites that are used as clinical markers for disease.

See also[edit]


  1. ^ a b "MedlinePlus Medical Encyclopedia: Uroflowmetry". From MedlinePlus, a service by the National Institutes of Health. Updated by: David C. Dugdale. Also reviewed by David Zieve. Update Date: 9/3/2010. Retrieved 2012-10-03.