Version 2.78

Term Description

This term was developed in collaboration with the National Institute of Health's National Eye Institute (NEI) as part of an effort to standardize the data elements collected by the National Ophthalmic Disease Genotyping and Phenotyping Network (eyeGENE).
Source: Regenstrief LOINC

Part Descriptions

LP200585-0   a-wave amplitude
The a-wave is an electroretinographic measurement of the initial corneal-negative deflection, derived from the cones and rods of the outer photoreceptor layers. This wave reflects the hyperpolarization of the photoreceptors due to closure of sodium ion channels in the outer-segment membrane. Absorption of light triggers the rhodopsin to activate transducin, a G-protein, which leads to the activation of cyclic guanosine monophosphate phosphodiesterase (cGMP PDE) and eventually to a reduction in the level of cGMP within the photoreceptor. Reduction in cGMP leads to closure of the sodium ion channels, which results in a decrease of inwardly directed sodium ions, or hyperpolarization of the cell. The a-wave amplitude is measured from baseline to the trough of the a-wave. Source: Regenstrief LOINC

LP200597-5   dark-adapted
Electrooculography (EOG) is a technique for measuring the resting potential of the retina. The EOG is used to assess the function of the pigment epithelium. During dark adaptation, the resting potential decreases slightly and reaches a minimum ("dark trough" or "Dt") after several minutes. When the light is switched on, a substantial increase of the resting potential occurs ("light peak" or "Lp"), which drops off after a few minutes when the retina adapts to the light. The ratio of the voltages (i.e., light peak divided by dark trough) is known as the Arden ratio and is normally above 1.80. The Arden ratio is often abnormal in retinitis pigmentosa, diabetic retinopathy, detached retina, Best disease and many other eye disorders. Source: Regenstrief LOINC

LP203648-3   EYE.ERG.NEI
Developed in collaboration with the National Institute of Health's National Eye Institute (NEI) as part of an effort to standardize the data elements collected by the National Ophthalmic Disease Genotyping and Phenotyping Network (eyeGENE). Source: Regenstrief LOINC

Fully-Specified Name

Component
a-wave amplitude^dark-adapted
Property
Elpot
Time
Pt
System
Retina.left
Scale
Qn
Method
Electroretinogram

Additional Names

Short Name
a-wave amp L ret dark-adapt ERG

Basic Attributes

Class
EYE.ERG.NEI
Type
Clinical
First Released
Version 2.54
Last Updated
Version 2.68
Order vs. Observation
Observation

Member of these Panels

LOINC Long Common Name
79894-2 Electroretinography (ERG) panel

Language Variants Get Info

Tag Language Translation
es-MX Spanish (Mexico) amplitud de onda a ^ adaptado a la oscuridad:Elpot:Punto temporal:Retina izquierda:Cuantitativo:Electroretinogram
it-IT Italian (Italy) onda A ampiezza^adattato al buio:Elpot:Pt:Retina.sinistra:Qn:Elettroretinografia
Synonyms: Ampiezza dell''onda A Concetti di elettroretinografia NEI eyeGENE Elettroretinogramma Mediante ERG Occhio Potenziale Elettrico (Voltaggio) Punto nel tempo (episodio) Retina Sinistra
zh-CN Chinese (China) a-波振幅^暗适应型:电势:时间点:视网膜.左侧:定量型:视网膜电图
Synonyms: A 型 A 波幅度;A 波波幅 a-波振幅（波幅、波幅度、幅度） L LT 伏特;伏特数;电位(伏特数);电位(电压);电势(伏特数);电压;电势(电压) 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 向左 向左侧 左 左侧（Left，LT，L） 左侧视网膜 左向 左边 时刻;随机;随意;瞬间 暗适应;光暗适应型;光暗适应 眼;眼睛;眼科;眼科学与验光变量;眼科学与验光指标 眼科学与视力测定变量.视网膜电图（视网膜电位图、视网膜电图描记术、视网膜电图描记法、视网膜电流描记、视网膜电流描记法、视网膜电流描记术、网膜电图学、视网膜电图描记、视网膜电能检验、视网膜电图学、ERG）.NEI;NEI eyeGENE''s electroretinogram concepts;NEI eyeGENE 视网膜电图描记术概念;Electroretinography;ERG 眼科学与视力测定变量.视网膜电图描记术（视网膜电图描记、视网膜电图描记法、视网膜电流描记、视网膜电流描记法、视网膜电流描记术、网膜电图学、视网膜电图、视网膜电能检验、视网膜电图学、ERG）;眼科学与视力测定变量.ERG;Electroretinography;ERG 视网膜电位图;眼电图;视网膜电图描记术;视网膜电图描记法;视网膜电流描记;视网膜电流描记法;视网膜电流描记术;网膜电图学;视网膜电图描记;视网膜电能检验;视网膜电图学;Electroretinogram;ERG 视衣

Example Units

Unit Source
mv 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=79774-6