4 doctors weighed in:
Whats a normal level for sm antibody?
4 doctors weighed in

Dr. John Goldman
Internal Medicine - Rheumatology
3 doctors agree
In brief: Depends on whose sm
Different labs have different ranges for their positive test.
They usually set the range for detection at a certain level. Below that level they have many people without lupus that would have a + test. Above that level is what they call a + test. But not all labs are created equal - so each has there own level determined by their scientific investigations.

In brief: Depends on whose sm
Different labs have different ranges for their positive test.
They usually set the range for detection at a certain level. Below that level they have many people without lupus that would have a + test. Above that level is what they call a + test. But not all labs are created equal - so each has there own level determined by their scientific investigations.
Dr. John Goldman
Dr. John Goldman
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