Understanding Your Medical Test: What It Is, How It Is Performed, and How to Prepare
This blood test detects antibodies that target the nucleolus (the control center within your cells) to help diagnose autoimmune diseases like systemic sclerosis.
{"A simple blood test that checks for nucleolar antibodies in your bloodstream","Helps doctors diagnose autoimmune conditions, primarily systemic sclerosis (scleroderma)","Results are reported as a titer (strength) and pattern using immunofluorescence","A positive result suggests your immune system may be attacking your own cells","Results must be interpreted with your symptoms and other test findings"}
Key facts at a glance
- LOINC
- 53991-6
- Short code
- ANA nucleolar Titr Ser IF
- Synonyms
- ANA nucleolar Titr Ser IF
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- if
- CPT
- 86038
- 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
This test is a diagnostic procedure that helps your doctor gather important information about your health. It can be used to check how well certain organs are working, look for signs of illness, monitor an ongoing condition, or confirm a diagnosis suggested by your symptoms and physical examination.
The nucleolar nuclear antibody test is a blood test that looks for specific antibodies in your blood. These antibodies target the nucleolus—a small structure inside the cell nucleus that helps produce proteins. The test uses a technique called immunofluorescence to detect and measure these antibodies, reporting results as a titer (strength) and a specific pattern.
How this test is performed depends on what your healthcare provider has ordered. Many tests use a small sample of blood drawn from a vein in your arm, while others use urine, a swab from the throat or nose, or imaging equipment. A trained professional will carry out the procedure, which usually takes only a few minutes and causes little discomfort.
A healthcare provider will draw a small blood sample from a vein in your arm. The sample is then sent to a laboratory where technicians examine it using special dyes and a fluorescence microscope. The lab will report both the titer (such as 1:40, 1:80, 1:160) and the pattern of fluorescence seen in the cells.
Preparation depends on the type of test you are having. Your care team may ask you to avoid eating or drinking for a certain number of hours, skip certain medicines or supplements, or drink extra water before your appointment. Follow the instructions you were given, and tell your provider about any medications, allergies, or health conditions you have before the test.
No special preparation is typically needed. You can eat and drink normally before the test. However, always follow any specific instructions your healthcare provider gives you. It's important to tell your doctor about any medications or supplements you are taking, as some drugs may affect test results.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The nucleolar pattern is most commonly associated with systemic sclerosis (also called scleroderma), an autoimmune disease that causes hardening of the skin and can affect internal organs. A positive nucleolar antibody test supports the diagnosis of systemic sclerosis when combined with clinical symptoms such as skin thickening, Raynaud's phenomenon, or gastrointestinal issues. The titer level may correlate with disease activity—higher titers often indicate more active disease. However, a positive result alone does not confirm a diagnosis; doctors must interpret results alongside your symptoms, physical examination, and other laboratory tests.
Frequently asked questions
What does a positive result mean?
What is a normal or negative result?
Do I need to repeat this test?
Can this test diagnose systemic sclerosis by itself?
Sources
- 1
- 2Mayo Clinic - ANA TestSource
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