Person—kidney damage marker (urine protein level), total milligrams per 24 hours N[NNN].N
Identifying and definitional attributes
|Metadata item type:||Data Element|
|Short name:||Kidney damage marker (urine protein level, milligrams per 24 hour)|
The amount of protein in a person's urine, used to detect kidney damage, measured as total milligrams per 24-hour period.
Public health, health care and clinical settings.
|Data Element Concept:||Person—kidney damage marker|
Value domain attributes
|Maximum character length:||5|
|Unit of measure:||Milligram per 24-hour period (mg/24h)|
|Unit of measure precision:||1|
Data element attributes
Collection and usage attributes
|Guide for use:|
Testing the protein level is used to evaluate kidney function by detecting elevated protein in the urine (proteinuria). A 24-hour urine protein level test consists of multiple samples of urine taken over a 24-hour period.
Timed urine collections are considered the gold standard for evaluating proteinuria, but are logistically difficult to collect. In routine clinical practice, 24-hour collections are inconvenient to patients and are subject to significant inaccuracies due to incomplete collection of all urine voided, timing errors and appreciable intra-individual variation due to varying activity, hydration and diet. Untimed spot urine specimens which are tested for protein/creatinine ratio (PCR) are now preferred, but 24-hour urine protein level tests may still be undertaken and are frequently used as a reference point for evaluating the accuracy of other tests. A positive test should be repeated to confirm persistence of proteinuria. Chronic kidney disease (CKD) is present if 2 out of 3 tests (including the initial test) are positive. If the first positive urine specimen is a random spot test (as it may be for opportunistic testing), then repeat tests should ideally be first morning void specimens.
Laboratory findings for 24-hour urine protein level tests are reported as the level of protein in urine and reported as total milligrams of protein per 24-hour period.
Urine protein level can be used to detect kidney damage and increased renal and cardiovascular disease risk. Urine protein levels which are higher than laboratory reference ranges are used to determine the level of kidney damage. The reference range for determining proteinuria using 24-hour urine protein level can be found in the Kidney Health Australia Caring for Australasians with Renal Impairment (KHA-CARI) CKD guidelines.
Source and reference attributes
Australian Institute of Health and Welfare (AIHW)
Kidney Health Australia (KHA) 2012. Caring for Australasians with Renal Impairment (CARI) Guidelines. Diagnosis, classification and staging of chronic kidney disease. Sydney: KHA. Viewed 20 October 2015, http://www.cari.org.au/CKD/CKD%20
|Related metadata references:|
See also Person—kidney damage marker (urine albumin level), total milligrams per 24 hours N[NNN].N
See also Person—kidney damage marker, protein/creatinine ratio N[NN].N
See also Person—kidney damage marker, urine albumin/creatinine ratio N[NN].N
|Implementation in Data Set Specifications:|
All attributes +
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