A positive result for anti-Sm antibodies is consistent with a diagnosis of lupus erythematosus.
What is SM in ANA profile?
Autoantibody to Smith antigen (Sm) which is considered to be specific for SLE was the first anti-ENA detected in 1966 [9].
What is SM AB test?
Clinical Significance Smith Antibody (Sm) is highly specific for systemic lupus erythematosus (SLE). Smith Antibody is also detected in approximately 15% of patients with SLE. Smith Antibody is detected in more than half of young African-American women with SLE.
What does SM antibody mean?
Abstract. Although anti-Smith (Sm) antibody is a highly specific antibody for systemic lupus erythematosus (SLE), the significance of anti-Sm antibody in patients with SLE is unclear. This study aimed to evaluate the association between anti-Sm antibodies and disease activity in patients with new-onset SLE.
What are the 4 types of lupus?
When people talk about lupus, they may be referring to the most common form—systemic lupus erythematosus (SLE). However, there are actually four kinds. Click or scroll to read more about each of them: SLE, cutaneous lupus, drug-induced lupus, and neonatal lupus.
What does a negative SM antibody mean?
As a diagnostic test, anti-Sm antibodies have a relatively low sensitivity but high specificity; thus, a positive test result is very useful in confirming the diagnosis. However, a negative test result does not exclude the diagnosis of SLE.
Is a positive ANA test serious?
Results. The presence of antinuclear antibodies is a positive test result. But having a positive result doesn’t mean you have a disease. Many people with no disease have positive ANA tests — particularly women older than 65.
What level of ANA indicates lupus?
ANA of 0, 1+ or 2+, or titers less than 1:80 (diluted 80 times) are usually unimportant. A positive ANA does not by itself diagnose lupus since about 10% of normal people and many people with other autoimmune diseases, such as thyroid disease, also have positive tests, but usually less strongly positive.
Can you have Smith antibodies and not have lupus?
Anti-Smith Antibody Tests The anti-Smith antibody, also known as the anti-Sm antibody, targets the body’s own proteins and is found almost exclusively in people with lupus. Though not all people with lupus have this antibody, those who do usually receive a diagnosis of lupus.
What is lupus pain like?
Lupus can also cause inflammation in the joints, which doctors call “inflammatory arthritis.” It can make your joints hurt and feel stiff, tender, warm, and swollen. Lupus arthritis most often affects joints that are farther from the middle of your body, like your fingers, wrists, elbows, knees, ankles, and toes.
What cancers are associated with positive ANA?
Neoplastic diseases may cause positive ANA. Some authors have described that ANA is found in the sera from lung, breast, head and neck cancer patients as frequently as in RA and SLE 3, 4, 5. Chapman et al. 6 has suggested that in breast cancer they may be used as an aid to early diagnosis.
What is SM AB?
Sm is a small nuclear ribonucleoprotein composed of several protein autoantigens designated B, B1, D, E, F, and G, which range in size from 11 kD to 26 kD.
What is SM antibody?
Clinical Information. Sm is a small nuclear ribonucleoprotein composed of several protein autoantigens designated B, B1, D, E, F, and G, which range in size from 11 kD to 26 kD. Sm antibodies are specific for lupus erythematosus (LE) and occur in approximately 30% of LE patients. The levels of Sm antibodies remain relatively constant…
What is Smith Sm antibodies?
Smith Antibody. The Sm and nuclear ribonucleoprotein (RNP) antigens are a particulate complex composed of small nuclear RNAs (U-RNAs) and proteins. This complex has also been referred to as extractable nuclear antigens (ENA), since it is soluble in saline. Autoantibodies to these antigens occur in systemic lupus erythematosis…
