Rretrnfl10oclockthicknessoct
A non-invasive eye imaging test that measures the thickness of the nerve fiber layer in the right retina to detect eye diseases.
{"Uses light waves to create detailed images of the retina","Measures thickness at specific clock hours around the optic nerve","Helps detect glaucoma and other optic nerve disorders","Quick, painless procedure taking about 10-15 minutes","No special preparation or eye drops needed beforehand"}
Key facts at a glance
- LOINC
- 86314-2
- Short code
- RNFL 10 OD OCT
- Synonyms
- R ret RNFL 10 o'clock thickness OCT
- Category
- cardiac
- Sample
- serum
- Container
- Not applicable - This is an imaging procedure, not a blood test
- Units
- N/A
- Ref low
- 70
- Ref high
- 140
- Critical range
- — – 10000 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 18 years
- Method
- Optical Coherence Tomography (OCT)
- CPT
- 92133
- SNOMED
- 421414006
- Specimen volume
- Not applicable - Imaging procedure
- Stability
- Not applicable - Imaging procedure
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 1–24 hours
- Order
- routine
What is this test?
Optical Coherence Tomography (OCT) is an advanced imaging test that uses light waves to take cross-sectional pictures of your retina. The retinal nerve fiber layer (RNFL) is a thin layer of nerve fibers that carries visual information from the retina to the brain. This test measures the thickness of these nerve fibers at specific points (clock hours) around the optic nerve, with clock hour 10 representing a specific location on the right eye.
Why is it performed?
This test is primarily used to: detect and monitor glaucoma, assess damage to the optic nerve, evaluate other neurological conditions that may affect the eye, and monitor the effectiveness of treatment for eye diseases.
What to expect during the test
You will sit in front of the OCT machine and rest your chin on a support. The technician will ask you to look at a specific target. The machine will scan your eye without touching it. The test is completely painless and takes only a few minutes. You may need to have your pupils dilated for better imaging.
Reference range
Retinal nerve fiber layer (RNFL) thickness at clock hour 10 in the right eye typically ranges from 70 to 140 micrometers in healthy adult eyes. Reference ranges vary by age and instrument manufacturer; normative database comparison is essential for interpretation.N/A
No fasting required. Patient should remove contact lenses if applicable. Pupil dilation may be performed to improve image quality, though modern spectral-domain OCT can often obtain adequate images through undilated pupils. Patient should be advised to avoid eye rubbing before the test.
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?
Do I need to fast before the test?
When will I get my results?
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