1ustskullxr
A dental X-ray measurement that assesses the relationship between your upper front teeth and lip.
{"Measures distance from upper front tooth edge to upper lip","Taken using skull or dental X-ray (lateral cephalogram)","Helps orthodontists plan tooth alignment treatment","Normal range varies by age and ethnicity","No special preparation needed before the X-ray"}
Key facts at a glance
- LOINC
- 60620-2
- Short code
- UCI-STOM
- Synonyms
- 1U-St Skull XR
- Category
- chemistry
- Sample
- serum
- Container
- Not applicable - radiographic examination
- Units
- N/A
- Ref low
- 18
- Ref high
- 24
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 12–100 years
- Method
- xr-measured
- CPT
- 70350
- SNOMED
- 3631008
- Specimen volume
- Not applicable
- Stability
- Not applicable
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 24–48 hours
- Order
- routine
What is this test?
The upper central incisor to stomion measurement is a dental X-ray measurement that calculates the distance between the cutting edge of your upper front tooth (central incisor) and the red border of your upper lip (stomion). This measurement is taken from a lateral skull X-ray, also called a cephalogram, which provides a side view of your head, teeth, and jaw.
How is the test performed?
During the test, you will stand or sit next to an X-ray machine while a technician positions your head properly. You may need to bite down on a small device to keep your teeth in the correct position. The X-ray machine will capture a side image of your skull and teeth. The measurement is then taken on the resulting image using specialized software or manual tools.
Why is this measurement important?
This measurement helps dentists and orthodontists understand how your upper teeth relate to your lips. It is an important part of planning orthodontic treatment (braces or aligners), evaluating facial growth, and assessing aesthetic proportions. The measurement can also help diagnose certain dental or jaw conditions.
Reference range
Reference range varies by population and age; typically 18-24 mm in adultsN/A
Patient should remove all metallic objects and dental appliances. Patient positioned in standardized cephalometric position with lips in resting position.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Does the test hurt?
Do I need to fast before this test?
How long does the test take?
Are there any risks?
When will I get my results?
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