ANA Test (Antinuclear Antibody) - Blood Test, Positive Meaning, Normal Range

Understanding the ANA Blood Test: Meaning, Results and Why It Matters

The ANA test, or antinuclear antibody test, is performed to check the presence of antibodies attacking the body's own cells. It helps detect autoimmune diseases like rheumatoid arthritis, lupus, etc. It is a blood test which is performed with minimal risk, and the report is usually available in 1-2 business days.

Keep reading to find out more about the ANA diagnostic test, why it is performed, its procedure, preparation, cost and more.

Quick Highlights Box

What is the ANA Test?

The ANA diagnostic test is a blood test that detects the antinuclear antibodies in an individual’s blood. Your immune system makes proteins called antibodies to fight foreign substances such as bacteria and viruses. Antinuclear antibodies are autoantibodies that target components within the nucleus of cells. Their presence may indicate autoimmune activity . When it targets the nucleus of the healthy cells, which sends signals for crucial cell functions, it is called “antinuclear”.

The ANA blood test is a crucial screening tool for different rheumatic and autoimmune diseases. It helps detect the autoimmune activities in your body. The antinuclear antibodies can cause inflammation and damage the tissue throughout your body. The ANA test helps in the early detection of such conditions to identify autoimmune conditions. A definitive diagnosis requires clinical evaluation and additional specific tests.

Why is the ANA Test Done?

The ANA test is done when your doctor suspects scleroderma, rheumatoid arthritis or any other autoimmune disease, based on the clinical manifestations of the patient. This helps identify the possible symptoms and causes of diseases accurately.

Here are the reasons why the ANA test is performed:

• Helps Detect Autoimmune Activity: This test helps identify if antinuclear antibodies are present in your body, which helps identify any autoimmune activity.
• Guides if Further Testing is Needed: If the result of the ANA test is positive, it indicates that you need more specific tests to confirm the actual conditions or autoimmune disease.
• Helps Monitor the Progression of Disease: This test helps keep track of the progression of any autoimmune conditions in the individual and also checks if the treatment is effective for the detected condition.

What Symptoms or Conditions Require an ANA Test?

Here are some of the symptoms that call for an ANA test:

• Feeling extremely tired
• Pain, stiffness, or swelling in the muscles or joints
• Persistent or recurring fever
• Weakness
• Cheeks and the bridge of your nose are getting a red rash, which seems like a butterfly rash.
• Tingling and numbness in the hands or feet
• Sensitivity to light
• Loss of hair

How is an ANA Blood Test Performed?

When your doctor recommends an antinuclear antibody (ANA) test, the only requirement is to collect the blood sample. The laboratory technician collects blood from the patient’s vein in the arm.

First, they clean the skin over the vein, using a disinfectant and then wrap a tight band around the upper arm so that the vein swells up and becomes more visible. The needle is then inserted into the vein to collect a blood sample.

It usually takes less than 5 minutes to complete the entire procedure. After the required blood is drawn, the lab technician will remove the needle and press the area with a cotton swab to prevent bruising or excessive bleeding. You can resume normal activities immediately after the blood collection.

Next, the blood sample tubes are labelled and sent to the diagnostic laboratory, where trained professionals analyse the sample and detect the antinuclear antibody levels. ANA with IFA (Indirect Immunofluorescence Assay) is the most commonly performed ANA test.

 Here are the steps for this test:

• Step 1: After collecting the blood sample, it is put on the slides to react with fixed human cell samples.
• Step 2: The slide contains known and purified nuclear antigens.
• Step 3: A dye-tagged fluorescent anti-human antibody is added to the slide, which attaches to ANAs if they are present.
• Step 4: The slides are then incubated and washed so the excessive dye particles are removed.
• Step 5: Next, the slides are tested under a special fluorescent microscope that is equipped with ultraviolet filters and light.
• Step 6: If apple green, a fluorescent stain of nuclear material is present, which indicates a positive.

As a result, IFA enables the sensitive visualisation and identification of antibodies targeting various nuclear components.

How to Prepare for the ANA Test?

Here are some of the preparation tips to follow before taking an ANA test:

• Consult withyour doctor about your medical history: Tell your doctor about all your symptoms, previous conditions, if you have been diagnosed with any autoimmune disease previously, etc. Such information helps check whether the ANA test is appropriate or not.
• Make a List of All Your Medications and Supplements: Medicines that include procainamide, hydralazine, and anti-seizure drugs can lead to drug-induced lupus, which indicates a positive ANA test result. Prepare a complete list of your prescription medicines, supplements, and over-the-counter medicines.
• Ask the Doctor About Your Medication Adjustments: In most cases, medications require no changes, but your healthcare provider may advise you to stop any specific medicines temporarily if they influence the interpretation of the ANA test.
• Preparation Before Visit: While going for the test, make sure you wear clothes that provide easy access to your arm and drink water beforehand so that the veins can be easily located.

How is the ANA Test Report Interpreted?

ANA in the blood report is interpreted in the following way:

1.  Titer represents the concentration of antibodies in an individual’s blood. It is interpreted in the following thresholds:

2. The staining pattern indicates the way antibodies bind to cells when seen under a microscope. The common patterns are as follows:

The ANA test normal range is the negative result, indicating the absence of antinuclear antibodies. However, a positive result may not always confirm the presence of an autoimmune disease but calls for further evaluation.

What Does a Positive ANA Test Mean?

An ANA positive means the production of antibodies by an individual’s immune system against the nuclei of cells, but it does not confirm a specific autoimmune disease. Along with the positive results, doctors will look for the patient’s symptoms, additional tests, and medical history.

When assessing positive results, doctors conduct further tests frequently to identify specific autoantibodies linked to diseases like lupus, Sjögren's syndrome, or rheumatoid arthritis.

The fluorescence pattern and ANA titre (antibody concentration) offer important hints regarding a potential diagnosis. While some patterns may indicate specific disorders like autoimmune hepatitis, Addison's disease, or thyroid diseases, higher titres typically indicate a greater likelihood of autoimmune disease.

What are the Risks and Limitations of the ANA Test?

The ANA test is usually of low risk as it only involves a blood test. So, the patient may experience bruising or slight pain in the area where the needle was inserted. However, it includes some limitations like the following:

• False Positives: A positive result may be false, which does not always involve the presence of any autoimmune disease. Even healthy individuals, usually elderly adults, which can guide further testing for specific autoantibodies.
• Non-specific Result: Getting a positive report indicates autoimmune activity, but it cannot identify the specific illness of the person.
• Need for Additional Testing: Thus, you need to undergo additional testing to diagnose the actual disease. This may include anti-ds DNA or anti-Smith antibodies tests.

What are the Benefits of the ANA Test?

Here are some of the notable benefits of getting an ANA test:

• Early Detection of Autoimmune Disease: ANA testing helps detect the autoimmune disorders that can damage an individual’s tissues or organs at an early stage. Getting an ANA test at the right time helps understand whether there is a possibility of a disorder or not.
• Reduces the Risk of Complication: If the autoimmune disease is detected at an early stage, it will help minimise the risk of developing any complications that are linked to the disease. A timely test helps the doctor begin the right treatment at the right time.
• Helps in Complete Assessment: Through an ANA blood test, it becomes easier to assess the different autoantibodies present in an individual's blood, which further helps identify specific antibodies that are linked to an autoimmune condition. This test helps in the specific and accurate diagnosis of autoimmune conditions.

Who Should Get an ANA test?

The following people normally require an ANA test:

• People with symptoms of autoimmune diseases.
• People who experience extreme fatigue
• People with unexplained physical symptoms, such as rashes.

What is the Cost of an ANA Test in India?

ANA test price usually varies depending on factors such as the location where you stay, the laboratory from which you are getting the test, etc. Here is an approximate price chart for the test for various cities:

Does Health Insurance Cover ANA Tests?

Most health insurance policies in India cover the expenses incurred in an ANA test. However, coverage may vary depending on your insurance company. So, it is essential to check with the inclusions and exclusions of your insurance provider while purchasing a policy to ensure whether it covers the cost of the ANA test or not.

Reader Information: The information provided in this article is for general informational and educational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider or doctor regarding any medical condition, symptoms, or test results. The interpretation of an ANA test should be done by a medical professional in conjunction with clinical findings and other diagnostic tests. Test costs, procedures, and insurance coverage may vary by location, laboratory, and individual policy terms. Please check with your healthcare provider and insurance company for accurate and personalised information.