79782-9
b-wave amplitude Left retina dark-adapted by ERG
Active
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
LP200586-8 b-wave amplitude
The b-wave is an electroretinographic (ERG) measurement of the corneal-positive deflection, derived from the inner retina (predominantly Muller and ON-bipolar cells). The hyperpolarization of the photoreceptor cells results in a decrease in the amount of neurotransmitter released, which subsequently leads to a depolarization of the post-synaptic bipolar cells. The bipolar-cell depolarization increases the level of extracellular potassium, subsequently generating a transretinal current. It is this transretinal current that depolarizes the radially oriented Muller cells and generates the corneal-positive deflection. The b-wave amplitude is generally measured from the trough of the a-wave to the peak of the b-wave. This wave is the most common component of the ERG used in clinical and experimental analysis of human retinal function.
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
- b-wave amplitude^dark-adapted
- Property
- Elpot
- Time
- Pt
- System
- Retina.left
- Scale
- Qn
- Method
- Electroretinogram
Additional Names
- Short Name
- b-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 b ^ adaptado a la oscuridad: |
| it-IT | Italian (Italy) | onda B ampiezza^adattato al buio: Synonyms: ampiezza dell''onda B Concetti di elettroretinografia NEI eyeGENE Elettroretinogramma Mediante ERG Occhio Potenziale Elettrico (Voltaggio) Punto nel tempo (episodio) Retina Sinistra |
| zh-CN | Chinese (China) | b-波振幅^暗适应型: Synonyms: B 型 b-波振幅（波幅、 |
Example Units
| Unit | Source |
|---|---|
| mV | Example UCUM Units |
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