Anti Nuclear Antibody (ANA-Elisa) Test

Antinuclear antibodies (ANAs) are a group of autoantibodies (proteins made by the immune system) that mistakenly target the nucleus of the body’s own healthy cells.

The Antinuclear Antibody (ANA) test helps detect the presence and level of ANAs in the blood. One of the most commonly used methods for this test is the enzyme-linked immunosorbent assay (ELISA), a laboratory technique that enables accurate and efficient detection of ANA.

The Antinuclear Antibody (ANA ELISA) test is widely used as a screening tool, as it can detect the presence of these antibodies in the blood. Doctors commonly recommend it to help evaluate suspected autoimmune connective tissue diseases (where the immune system attacks the body’s own tissues), such as systemic lupus erythematosus and rheumatoid arthritis.

An ANA test is not a routine test and is usually recommended when a doctor suspects an autoimmune disorder based on your symptoms. You may be advised to get an ANA test if you have symptoms such as:

• Persistent joint pain or swelling
• Unexplained fatigue
• Fever without a clear cause
• Skin rashes (especially a butterfly-shaped rash on the face)
• Mouth or nose ulcers
• Hair loss
• Sensitivity to sunlight

The ANA ELISA test is typically performed based on an individual’s need rather than on a routine schedule.

The ANA ELISA test is primarily used as a screening tool to help identify autoimmune disorders. It is commonly associated with the following conditions:

• Autoimmune thyroid disorders: Conditions such as Hashimoto’s thyroiditis and Graves’ disease can lead to underactive and overactive thyroid function, respectively.
• Rheumatoid arthritis: An autoimmune condition that mainly targets the joints, leading to pain, stiffness, and swelling, especially in the hands, wrists, and feet.
• Addison’s disease: An autoimmune disorder affecting the adrenal glands, resulting in symptoms such as fatigue, weakness, and low hormone levels.
• Autoimmune hepatitis: A condition in which the immune system attacks the liver, causing inflammation and potential liver damage.
• Sjögren’s syndrome: A condition that primarily affects the glands responsible for producing tears and saliva, leading to dry eyes and dry mouth.
• Systemic lupus erythematosus (SLE): A chronic autoimmune disease that can affect multiple organs, including the skin, joints, kidneys, heart, lungs, blood vessels, and brain.
• Scleroderma: A rare disorder characterised by hardening and tightening of the skin, and in some cases, the involvement of blood vessels and internal organs.

What to Expect Before the ANA Test

No fasting is required for a standalone ANA test. You can eat and drink normally. However, if it is part of a broader package that includes fasting tests, your doctor may advise fasting for 8-12 hours. Avoid strenuous exercise for 24 hours before the test, as intense physical activity can temporarily raise ANA levels and affect interpretation. Always inform your doctor about any ongoing medications.

What to Expect During the Blood Collection

A phlebotomist cleans the skin with an antiseptic, then places an elastic band around your upper arm to make the veins easier to access. A small needle is inserted into the vein; you may feel a brief pinch. Blood is collected into a labelled tube in under a minute.

What to Expect After the ANA Test

A small cotton swab and bandage are placed over the site to stop any minor bleeding. You can return to normal activities immediately. Minor bruising is normal and disappears quickly. If dizzy, sit and rest for a few minutes.

The ANA blood test primarily measures the presence and level of only one parameter in the blood.

• ANA Level: Detects the level of antinuclear antibodies present in the blood.

The ANA test normal range is shown in the table below.

Note:

• ANA results can vary depending on the age and sex of the individual and the laboratory method used.
• Test results should always be evaluated by a qualified doctor along with symptoms and medical history.

ANA ELISA test results are interpreted as follows.

Note:

• A positive ANA result does not always mean an autoimmune disease, as low levels may be seen in healthy individuals.
• A negative ANA test result does not completely rule out autoimmune conditions, so further testing may be needed if symptoms persist.
• Certain infections, medications, and other medical conditions can also lead to positive ANA results.
• ANA results are usually interpreted along with other autoantibody tests for accurate diagnosis.

The ANA test is a simple and safe blood test, but like all diagnostic tests, it has certain limitations that should be considered.

Risks:

• The test involves a routine blood draw, which may cause mild pain, bruising, or slight bleeding at the needle site. However, this is rare, and if it does occur, it usually resolves on its own.

Limitations:

• A positive ANA result does not always indicate an autoimmune disease, as low levels can be found in healthy individuals.
• ANA can sometimes appear after viral infections, in people with long-term infections, or in those taking certain medications.
• Certain antibodies (heterophilic antibodies) and rheumatoid factor (RF) in the blood can affect test results. People who are frequently exposed to animals or animal-based products may be more likely to have this issue. People who have been treated with antibodies derived from mice (mouse-derived monoclonal antibodies) may also have falsely high or falsely low levels.
• ANA testing alone cannot confirm a diagnosis and must be interpreted along with clinical findings and other specific tests.

If the ANA test result is positive or if an autoimmune condition is suspected, doctors may recommend additional tests such as:

• Complete blood count (CBC)
• Autoantibody tests, such as anti-double stranded DNA (anti-dsDNA)
• C-reactive protein (CRP) test
• Erythrocyte sedimentation rate (ESR) test
• Rheumatoid factor (RF)
• Urinalysis

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