What does a positive RNP antibody mean?
A positive RNP (ribonucleoprotein) antibody test means your immune system is making antibodies that attack certain proteins inside your cells. This happens in lupus and some related conditions.
If you have lupus and test positive for RNP antibodies, it could indicate:
- You may have Show Full Answer
What does a positive RNP antibody mean?
A positive RNP (ribonucleoprotein) antibody test means your immune system is making antibodies that attack certain proteins inside your cells. This happens in lupus and some related conditions.
If you have lupus and test positive for RNP antibodies, it could indicate:
- You may have mixed connective tissue disease (MCTD), which combines symptoms of lupus with other autoimmune conditions
- You might experience certain symptoms like Raynaud's phenomenon (fingers/toes turning white or blue in cold), muscle aches, or skin rashes
- Your lupus might be more active initially, though many people still achieve remission over time
It's important to know that only 38-44% of people with lupus have RNP antibodies, so it's not found in everyone. The test is much more common in MCTD, where 95-100% of people test positive.
Regarding the "high (16)RP155" result, this specific value format isn't standard terminology in lupus antibody testing. It's best to ask your rheumatologist to explain what this particular number means in the context of your lab's testing methods, as different labs may report results differently.
Your doctor will look at your symptoms, medical history, and other test results together with the RNP antibodies to understand what this means for your care.
October 26, 2025
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