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Sm (SMITH) ANTIBODY, IgG
Detection of autoantibodies against the Smith protein, associated with autoimmune diseases.
Sample Type
blood
Fasting Required
No
Description
The Smith (SMITH) Antibody, IgG test is used to detect antibodies against the Smith protein, which is a specific target in autoimmune diseases, particularly systemic lupus erythematosus (SLE). A positive result may indicate the presence of SLE or other autoimmune disorders.
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How our test process works!
Overview:
- The test measures the level of IgG antibodies against the Smith antigen (Sm), which is part of a group of nuclear antigens.
- It is primarily used in the diagnosis of systemic lupus erythematosus (SLE), especially when other markers (like ANA, antinuclear antibodies) are inconclusive.
Risk Assessment:
- Risk Factors for Testing: The test is often ordered when someone exhibits symptoms of SLE or other autoimmune diseases. Common symptoms include joint pain, skin rashes, fever, and fatigue.
- People with family histories of autoimmune diseases, particularly lupus, may be at higher risk of developing such antibodies.
Normal Range:
- Normal: A negative result means no detectable anti-Smith antibodies in the blood. This is generally the case in healthy individuals or in those without autoimmune disorders.
- Abnormal: Any detectable amount of anti-Smith antibodies would typically be considered abnormal. The level of these antibodies is measured in units per milliliter (U/mL), and specific reference ranges can vary between laboratories.
Interpretation:
- Positive result: A positive result indicates the presence of anti-Smith antibodies, which is strongly associated with systemic lupus erythematosus (SLE), but it can also be found in other autoimmune conditions, such as mixed connective tissue disease. The presence of these antibodies is typically considered a highly specific marker for SLE.
- Negative result: A negative result suggests that anti-Smith antibodies are not present, which does not exclude the diagnosis of SLE, as other tests (such as ANA or anti-dsDNA) may still be used for a more comprehensive diagnosis.
Sample Type:
- The test requires a blood sample, typically drawn from a vein in the arm.
Frequently Asked Question
The test is primarily used to help diagnose systemic lupus erythematosus (SLE) and other autoimmune diseases. A positive result indicates the presence of antibodies that target proteins in the body, which is characteristic of SLE
The test is done through a blood sample, typically drawn from a vein in your arm. The blood is then sent to a laboratory for analysis to check for the presence of anti-Smith IgG antibodies.
Positive result: The presence of anti-Smith antibodies is a strong indicator of SLE. However, it can also be found in a small percentage of people with other autoimmune diseases.
Negative result: A negative result generally means that anti-Smith antibodies were not detected. However, it does not completely rule out SLE or other autoimmune diseases.
Symptoms of autoimmune diseases like lupus may include joint pain, fatigue, skin rashes (especially a butterfly-shaped rash on the face), photosensitivity, and kidney problems.
No, while anti-Smith antibodies are highly specific to lupus, they can sometimes appear in other autoimmune conditions. However, they are considered one of the most specific markers for lupus.
The test itself has minimal risks, as it only involves drawing a blood sample. As with any blood draw, there may be minor discomfort, bruising, or, in rare cases, infection at the site of the needle.
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Sm (SMITH) ANTIBODY, IgG
Detection of autoantibodies against the Smith protein, associated with autoimmune diseases.
Offered by other labs
Sample Type
blood
Fasting Required
No
Description
The Smith (SMITH) Antibody, IgG test is used to detect antibodies against the Smith protein, which is a specific target in autoimmune diseases, particularly systemic lupus erythematosus (SLE). A positive result may indicate the presence of SLE or other autoimmune disorders.
Covid Safety
Assured
Free Report
Counselling