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ENA POSITIVE
My younger sister has had Lupus for 18 yrs, recently I have had joint pain along with other familiar symptoms, my ANA was 160 and my ENA is positive, what does a positive ENA mean?  Will I have to go through more tests before Rheumatologist diagnosis me or could the above point to Lupus?
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I copied and pasted this from another website.  

Question:
Please discuss the difference between an ANA test and an ENA test. My ANA blood test came back positive, with Fin Spec, and now the doctor wants to do and ENA test. What is that?


Answer:
ANA is an acronym for Anti-Nuclear Antibody. Its use in Rheumatology is to screen for Connective Tissue Diseases; however, the presence of an ANA is not isolated to rheumatic diseases. The ANA is elevated by detecting antigens within the nucleus of a certain type of cell (most commonly, a Human Epithelial, type 2 cell (HEp-2)). However, the specific antigen within the nucleus that causes the elevation of the ANA is not known with the ANA test alone.

The ENA panel is an acronym for Extractable Nuclear Antigens. The ENA panel detects specific antigens within the nucleus that might be responsible for the elevated ANA. By knowing the specific antigen that is elevated, your physician may be able to better interpret your clinical data to arrive at a diagnosis.

Of note, it is not uncommon to have an elevated ANA and normal ENA panel. Also of note, the components of an ENA panel may vary between laboratory to laboratory.


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