Log In

Term 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.

LOINC Names Get Info

Fully-Specified Name
Glomerular filtration rate:ArVRat:Pt:Urine+Ser/Plas:Qn:Isotopic based on 1.73 sq M
Long Common Name
Isotopic Glomerular filtration rate/1.73 sq M [Volume Rate/Area] in Urine and Serum or Plasma
Short Name
Isotopic GFR/1.73 sq M Ur+SerPl-ArVRat
Display Name
GFR Isotopic based on 1.73 sq M (U+S/P) [Vol rate/Area]
Consumer Name Alpha Get Info
GFR, Urine+Blood

Part Model Get Info

  • Component
    Glomerular filtration rate
    LP69203-5
    • Analyte
      Glomerular filtration rate
      LP69203-5
      • Component Numerator
        Glomerular filtration rate
        LP69203-5
        • Component Numerator Core
          Glomerular filtration rate
          LP69203-5
        • Component Numerator Core Suffix
          NULL
           
      • Component Denominator
        NULL
         
        • Component Denominator Core
          NULL
           
        • Component Denominator Core Suffix
          NULL
           
    • Challenge
      NULL
       
    • Adjustment
      NULL
       
    • Count
      NULL
       
  • Property
    ArVRat
    LP6787-8
  • Time
    Pt
    LP6960-1
  • System
    Urine+Ser/Plas
    LP32517-2
    • System Core
      Urine+Ser/Plas
      LP32517-2
    • Super System
      NULL
       
  • Scale
    Qn
    LP7753-9
  • Method
    Isotopic based on 1.73 sq M
    LP443416-5

Basic Attributes

Class
CHEM
Type
Laboratory
First Released
Version 2.52
Last Updated
Version 2.79 (NAM)
Change Reason
Release 2.79: COMPONENT: Triggered by Coll w SCT: eGFR measurement representation in LOINC had changed in LOINC: Component: Glomerular filtration rate, and Method: .../1.73 sq.M among non-black population or …/1.73 sq.M among black population, and others….; Release 2.72: FORMULA: Formula removed from visible LOINC field due to complexity.;
Order vs. Observation
Both

Language Variants Get Info

TagLanguageTranslation
cs-CZCzech (Czechia)Glomerulární filtrace/1,73 m exp 2:Objemový tok/plocha:Časový bod:Moč a sérum/plazma:Kvantitativní:Izotopový
es-ESSpanish (Spain)Tasa de filtración glomerular:Indice de Volumen/Área:Punto temporal:Orina y suero o plasma:Qn:Isotópico basado en 1,73 m2 de superficie corporal
Synonyms: Cuantitativo
es-MXSpanish (Mexico)Tasa de filtración glomerular / 1,73 m2:Tasa de volumen / área:Punto temporal:Orina y suero o plasma:Cuantitativo:Isotópico
fr-FRFrench (France)Filtration glomérulaire corrigée:Volume arbitraire/Temps:Ponctuel:Urine+Sérum/Plasma:Numérique:Mesure isotopique par 1,73m2
it-ITItalian (Italy)Tasso di filtrazione glomerulare:ArVRat:Pt:Urina+Siero/Plasma:Qn:Isotopico basato su 1,73 m2
Synonyms: basato su 1.73 sq M Chimica GFR Plasma Punto nel tempo (episodio) Siero Siero o Plasma Tasso Volume/Area Urine & Siero o Plasma
pl-PLPolish (Poland)Wskaźnik filtracji kłębuszkowej:wskaźnik objętości w jednostce czasu na powierzchnię:punkt w czasie:mocz i surowica lub osocze:ilościowy:izotopowy w przeliczeniu na 1,73 m2
Synonyms: GFR;wskaźnik przesączania kłębuszkowego izotop przeliczony na powierzchnię ciała o wartości 1,73 m2
zh-CNChinese (China)肾小球滤过率:单位面积体积速率:时间点:尿液+血清/血浆:定量型:同位素基于 1.73 平方米
Synonyms: Sq M 化学;化学检验项目;化学检验项目类;化学类;化学试验;非刺激耐受型化学检验项目;非刺激耐受型化学检验项目类;非刺激耐受型化学试验;非刺激耐受型化学试验类 单位面积的体积速率;每个单位的单位时间体积;体积速率/面积比率 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 同位素基于 1.73 sq M 同位素方法;同位素;放射性同位素法;放射性同位素方法;放射性同位素;放射性同位素示踪法 基于 1.73 sq M 小球 小球的 尿 & 血清或血浆;尿+血清/血浆;尿与血清或血浆;尿液 & 血清或血浆;尿液与血清或血浆 尿;小便;下泉 平方米（Square Meter，Sq M） 时刻;随机;随意;瞬间 肾丝球过滤率;肾小球过滤率;肾丝球滤过率;腎小球濾過率;Glomerular filtration rate;GFR 肾小球的 血清或血浆 速度

Example Units

UnitSource
mL/min/{1.73_m2}Example UCUM Units

LOINC Terminology Service (API) using HL7® FHIR® Get Info

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=78006-4