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Urine protein/creatinine ratio is a widely used initial method to estimate daily protein excretion in urine. [1] [2] [3] Since the diagnosis and management of proteinuric renal diseases and the staging of chronic kidney disease depend on accurate identification and quantitation of proteinuria, [4] [1] the implementation of the 24-hour urine collection is the most accurate procedure in practice ...
Abnormal kidney function may cause too much or too little urine to be produced. The ability of the kidneys to filter protein is often measured, as urine albumin or urine protein levels, [2] measured either at a single instance or, because of variation throughout the day, as 24-hour urine tests. [citation needed]
To assess the adequacy of a complete collection, one always calculates the amount of creatinine excreted over a 24-hour period. This amount varies with muscle mass and is higher in young people/old, and in men/women. An unexpectedly low or high 24-hour creatinine excretion rate voids the test.
A better estimate of kidney function is given by calculating the estimated glomerular filtration rate (eGFR). eGFR can be calculated without a 24-hour urine collection, using serum creatinine concentration and some or all of the following variables: sex, age, and weight, as suggested by the American Diabetes Association. [19]
If proteinuria is persistently detected by dipstick testing, a 24-hour urine collection can be performed to obtain an accurate measurement of protein levels; alternatively, protein excretion can be estimated from the urine protein/creatinine ratio of a single specimen. Measuring the amount of protein in the urine helps to distinguish between ...
Proteinuria of greater than 3.5 g /24 h /1.73 m 2 (between 3 and 3.5 g/24 h /1.73 m 2 is considered to be proteinuria in the nephrotic range) or greater than 40 mg/h/m 2 in children. [9] [10] The ratio between urinary concentrations of albumin and creatinine can be used in the absence of a 24-hour urine test for total protein. This coefficient ...
Examination of the urine allows a direct assessment for possible kidney problems, which may be suggested by appearance of blood in the urine , protein in the urine (proteinuria), pus cells in the urine or cancer cells in the urine. A 24-hour urine collection used to be used to quantify daily protein loss (see proteinuria), urine output ...
Urinary albumin excretion can also be measured by urinary albumin/creatinine ratio in a spot urine sample, which is as accurate but more convenient than a 24-hour urine collection. [ 29 ] It is recommended that individuals with diabetes have their albumin levels checked annually, beginning immediately after a diagnosis of type 2 diabetes and ...