Version 2.72

68965-3Rg Ag [Presence] on Red Blood CellsActive

Part Descriptions

LP135640-3   R little g
The first example of anti-Chido was studied both in Minneapolis and London in 1962. Six other examples were identified in 1964 and 1965. The antibody was officially reported in 1967 and named after one of the early patients. Nine years later a similar and related antibody was described, ie. anti-Rodgers. Initially it was believed that these might be white cell or HLA antibodies. When the first several antibody producers were HLA typed, it was found that they all had the HLA-A1,B8 phenotype. In addition, human plasma was able to inhibit both of these antibodies. Finally, in 1978 the association became clear when it was shown that both Chido (Ch) and Rodgers (Rg) were epitopes carried on the fourth component of complement (C4). The genes for C4 are closely linked to the HLA genes. Source: Serum, Cells and Rare Fluid Exchange, SCARF

LP135640-3   R little g
The Rodgers (Rga) antigen is a plasma protein that binds to the red blood cell (RBC) membrane. About 2 to 3% of the transfusion-recipient white population lacks the antigen and can produce anti-Rga antibody. Source: Regenstrief LOINC

Fully-Specified Name

R little g Ag

Additional Names

Short Name
Rg Ag RBC Ql
Display Name
Rg Ag Ql (RBC)
Consumer Name Alpha
Rg antigen, Red blood cells

Example Answer List LL744-4

Source: Regenstrief Institute

Answer Code Score Answer ID
Detected LA11882-0
Not detected LA11883-8

Basic Attributes

First Released
Version 2.38
Last Updated
Version 2.56
Change Reason
The PrThr property is used for LOINC terms whose results are reported using an ordered categorical scale, regardless of whether or not an internal threshold was used to make that determination. This change was approved by the Laboratory LOINC Committee in June 2016.
Order vs. Observation

Member of these Panels

LOINC Long Common Name
93914-0 Blood group antigens panel - Red Blood Cells

Language Variants Get Info

zh-CNChinese (China)
Rg 抗原:存在情况或阈值:时间点:红细胞:序数型:
nl-NLDutch (Netherlands)
R kleine g Ag:aanwezigheid:moment:erytrocyten:ordinaal:
fr-CAFrench (Canada)
R petit g , Ag:Présence-Seuil:Temps ponctuel:GR:Ordinal:
fr-FRFrench (France)
CH/RG (Rg) antigène:Présence/Seuil:Ponctuel:Érythrocytes:Qualitatif:
it-ITItalian (Italy)
R g minuscola , Ag:PrThr:Pt:RBC:Ord:
ru-RURussian (Russian Federation)
R малое g Аг:PrThr:ТчкВрм:Эритроциты:Пор:
es-MXSpanish (Mexico)
R poco g Ag:Presencia o umbral:Punto temporal:Eritrocitos:Ordinal:
es-ESSpanish (Spain)
R g minúscula Antígeno:PrThr:Punto temporal:Glóbulos rojos:Ord:
tr-TRTurkish (Turkey)
R küçük g Ag:MevcEşik:Zmlı:Eritrosit:Srl:

LOINC FHIR® API Example - CodeSystem Request Get Info