Rretrnflnasalthicknessoct
This test measures the thickness of the retinal nerve fiber layer on the nasal side of the right eye using optical coherence tomography (OCT) imaging.
{"Measures the thickness of nerve fiber layer in the right eye","Uses painless OCT scanning technology","Helps detect early signs of glaucoma and neurological conditions","Takes only a few minutes to complete","No special preparation is needed"}
Key facts at a glance
- LOINC
- 86284-7
- Short code
- RNFL-N-OD
- Synonyms
- R ret RNFL nasal thickness OCT
- Category
- cardiac
- Sample
- serum
- Container
- N/A - Imaging study
- Units
- N/A
- Ref low
- 50
- Ref high
- 85
- Critical range
- 40 N/A – 10000 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 18 years
- Method
- Optical Coherence Tomography (OCT)
- CPT
- 92134
- SNOMED
- 371632003
- Specimen volume
- N/A - No specimen collected
- Stability
- N/A - Imaging study
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 24–72 hours
- Order
- routine
What is this test?
The Right Retina Retinal Nerve Fiber Layer (RNFL) Nasal Thickness test is an imaging procedure that measures the thickness of the nerve fiber layer on the nasal side of your right retina. This test uses Optical Coherence Tomography (OCT), which is a non-invasive imaging technology that uses light waves to create detailed cross-sectional images of your retina.
How is the test performed?
During the test, you will sit in front of the OCT machine and place your chin on a support. The technician will ask you to look at a specific target while the scanner takes images of your eye. The process is completely painless and takes only a few minutes. No eye drops or injections are required.
How should I prepare?
No special preparation is needed for this test. You can eat and drink normally before the procedure. If you wear glasses or contact lenses, you may need to remove them for the test. Inform your doctor about any eye conditions or surgeries you have had.
Reference range
Normal nasal RNFL thickness ranges from 50-85 microns in adults. Values below 50 microns may indicate retinal nerve fiber layer thinning suggestive of glaucoma or optic nerve pathology.N/A
No special preparation required. Patient should remove eye makeup and contact lenses before the procedure. Pupillary dilation may be performed for better imaging.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Does the test hurt?
How long does the test take?
When will I get my results?
Do I need to fast before this test?
Are there any side effects?
Sources
- 1
- 2
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy