In adults, urine output of less than how much is considered oliguria?

May 16, 2023 Source: Cainiu Health

Dr. Zhao Xinju

Introduction

In adults, urine output is considered oliguria if the total 24-hour volume is less than 400 milliliters or if hourly urine output persistently falls below 17 milliliters. Normally, the total 24-hour urine volume ranges between 1500 and 2500 milliliters. However, urinary output may vary due to factors such as age, climate, and fluid intake.

If an adult's urine output is less than 400 milliliters in 24 hours, or consistently less than 17 milliliters per hour, it is referred to as oliguria. Detailed analysis is as follows:

Under normal circumstances, the total urine output over 24 hours typically ranges between 400 and 2500 milliliters. However, due to various factors such as age, climate, and fluid intake, urinary volume may vary among individuals. When the total urine output in 24 hours falls below 400 milliliters, or hourly output drops below 17 milliliters, this condition is defined as oliguria. If urine output is excessively low, metabolic waste products cannot be adequately excreted through the kidneys, which may indicate impaired kidney function.

There are numerous potential causes of oliguria. It may result from physiological factors such as insufficient fluid intake or a very dry diet. However, it could also be associated with medical conditions such as acute myocardial infarction, acute glomerulonephritis, or lupus nephritis—conditions that during their course may lead to a decreased glomerular filtration rate. Patients are advised to seek care at a hospital's nephrology department, identify the specific underlying cause, and receive targeted treatment accordingly.

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