Rretrnflsupthicknessoct
This test measures the thickness of the superior retinal nerve fiber layer in the right eye using optical coherence tomography (OCT), an imaging technique used to detect glaucoma and optic nerve damage.
{"OCT is a non-invasive imaging test that takes pictures of your retina","The test measures the thickness of nerve fiber layers to detect early damage","It helps diagnose and monitor glaucoma and other optic nerve diseases","The procedure is quick, painless, and does not require any eye drops or radiation","Results help your doctor determine if treatment is needed"}
Key facts at a glance
- LOINC
- 86276-3
- Short code
- RNFL-S-RT-OCT
- Synonyms
- R ret RNFL sup thickness OCT
- Category
- cardiac
- Sample
- serum
- Container
- Not applicable - imaging test
- Units
- N/A
- Ref low
- 100
- Ref high
- 140
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 18 years
- Method
- Optical Coherence Tomography (OCT)
- CPT
- 92134
- SNOMED
- 397540003
- Specimen volume
- Not applicable - imaging test
- Stability
- Not applicable - imaging test
- 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) Superior Thickness test uses Optical Coherence Tomography (OCT) to measure the thickness of the superior (upper) portion of the retinal nerve fiber layer in your right eye. The retina is the light-sensitive tissue at the back of your eye, and the nerve fiber layer contains the axons of ganglion cells that carry visual information to the brain.
How is the test performed?
During the OCT test, you will sit in front of a machine and rest your chin on a support. The machine will scan your eye using light waves to create detailed cross-sectional images of your retina and optic nerve. The test takes only a few minutes and is completely painless. No eye drops or radiation are involved.
Why is this test important?
Measuring RNFL thickness is crucial for detecting and monitoring conditions that affect the optic nerve, particularly glaucoma. Glaucoma causes progressive damage to the optic nerve, which often shows as thinning of the RNFL before vision loss occurs. Early detection allows for timely treatment to prevent further damage.
Reference range
Normal superior retinal nerve fiber layer thickness ranges from approximately 100-140 microns in healthy adults. Values may vary by instrument manufacturer and patient age.N/A
No special preparation required. Patient should remove eye makeup and contact lenses if applicable. Pupils may be dilated for optimal imaging.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Do I need to prepare for the test?
Is the test painful?
How long does the test take?
When will I get my results?
How often should I have this test?
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 16, 2026. · Read our editorial policy