Oliguria

Oliguria is a medical condition where a person produces a very small amount of urine. This condition is generally defined as passing less than 400 milliliters of urine over a 24-hour period. Oliguria is most commonly caused by dehydration, kidney disease, and certain medications. In some cases, it can also be a sign of shock, heart failure, or other medical conditions. In cases of dehydration, the body attempts to conserve the fluid it has left by reducing the amount of urine it produces. This is because the body's water needs are not being met, so it begins to conserve its resources. Kidney disease can also cause oliguria because the kidneys are not filtering the blood properly, resulting in less urine being produced. Certain medications, such as diuretics, can also be responsible for oliguria as they reduce the amount of fluid retained by the body. Oliguria can also be a sign of other conditions, such as shock, heart failure, and severe infections. In these cases, treatment of the underlying condition is necessary to reduce the amount of urine produced. In cases of dehydration, rehydration is the most important step in treatment. If the cause of the oliguria is unknown, further tests may be necessary to determine the cause.