Junctional Protein (JUP) in Serum
This test measures the concentration of junctional protein in your blood serum. Junctional protein is involved in cell adhesion and tissue integrity, though its clinical relevance in routine testing is limited.
["Understanding junctional protein levels may help assess rare conditions affecting cell junctions, but results are not typically used for general health monitoring."]
Key facts at a glance
- LOINC
- 18550-4
- Short code
- J Pnt ST Amp+20ms L-V1
- Synonyms
- J Pnt ST Amp+20ms L-V1
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ekg
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may order this test if you have symptoms or conditions linked to defects in cell adhesion, such as rare genetic disorders affecting skin, gastrointestinal, or vascular tissues. It may also be part of a broader investigation into unexplained chronic wounds, bleeding disorders, or autoimmune conditions.
What to Expect Before the Test
No special preparation is usually needed. You may fast if instructed, but check with your provider. Bring any medications or supplements you’re currently taking, as they could affect results.
During the Test Process
A healthcare professional will draw blood from a vein in your arm. You may feel a brief pinch, but the process is quick. The blood sample will be sent to a lab for analysis using immunoassay techniques to detect junctional protein levels.
What the Results Mean
Results are reported as a concentration value (e.g., mass concentration in units like mg/dL or µg/mL). Abnormal levels may suggest underlying conditions affecting cell junctions, but interpretation depends on clinical context and other test results.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Junctional Protein Level
Frequently asked questions
Junctional protein is primarily studied in research contexts for rare genetic disorders. Elevated or low levels may indicate specific syndromes (e.g., epidermolysis bullosa or vascular diseases), but this test is not routinely used for diagnosing common conditions. Always discuss results with your provider for personalized guidance.
Will this test affect my medications or treatments?
How often will I need this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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