Isotopic Glomerular filtration rate/1.73 sq M [Volume Rate/Area] in Urine and Serum or Plasma 78006-4
LOINC Code
| LOINC code | 78006-4 | ||
|---|---|---|---|
| name | Isotopic Glomerular filtration rate/1.73 sq M [Volume Rate/Area] in Urine and Serum or Plasma | ||
| description | This test measures kidney filtration after injection of a radioactive tracer (e.g. technetium 99m DTPA). It is an actual measurement of glomerular filtration rate (GFR). The test is a several hour long kidney function test typically performed to accurately verify the level of renal dysfunction. It requires sequential collection of both blood and urine specimens after the tracer injection. Isotopic GFR may be used for monitoring renal function over time, or in chronic renal failure patients approaching dialysis. [PMID: 1391702] The submitter's lab uses the following formula to determine GFR: GFR = (UV/P) x (1.73/BSA) Where, for each timed urine collection, U = (urine collection CPM = UbkgCPM) V = urine flow rate: (urine volume / elapsed time) in units of mL/min P = (average serum or plasma CPM = Bbkg CPM) The average serum CPM (counts per minute) will be the average of Bo and B1 for the first urine collection (U1) and the average of B1 and B2 for the second collection (U2). Average the calculated GFR results for the two collection periods to obtain the final GFR result. | ||
| status | ACTIVE | ||
Fully-Specified Name | |||
| component | Glomerular filtration rate/1.73 sq M | ||
| property | ArVRat = Volume Rate/Area | ||
| time | Pt = Point in time: To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements. | ||
| system | Urine+Ser/Plas Ser = Serum Plas = Plasma | ||
| scale | Qn = Quantitative: The result of the test is a numeric value that relates to a continuous numeric scale. Reported either as an integer, a ratio, a real number, or a range. The test result value may optionally contain a relational operator from the set {<=, <, >, >=}. Valid values for a quantitative test are of the form "7", "-7", "7.4", "-7.4", "7.8912", "0.125", "<10", "<10.15", ">12000", 1-10, 1:256 | ||
| method | Isotopic | ||
Additional Names | |||
| short name | Isotopic GFR/1.73 sq M Ur+SerPl-ArVRat | ||
Basic Attributes | |||
| class | CHEM | ||
| type | 1 Laboratory | ||
| order vs. observation | Both | ||
| example UCUM units | mL/min/{1.73_m2} The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business (www.unitsofmeasure.org) | ||
| example unit | mL/min/1.73 sq m | ||
Associated Observations | |||
LOINC codes that represent optional associated observation(s) for a clinical observation or laboratory test. A LOINC term may represent a single associated observation or panel containing several associated observations. | |||
History/Usage | |||
| first released | |||
| last updated | 2.72 | ||
| last change type | MIN - change to field other than name | ||
| change reason | Release 2.72: FORMULA: Formula removed from visible LOINC field due to complexity.; | ||
Related Names | |||
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