Was your titer 1:80? This is considered low positive and your doctors will probably want to run more tests.
The titer shows how many times the technician had to mix fluid from the your blood to get a sample free of ANAs. Thus a titer of 1:640 shows a greater concentration of ANA than 1:320 or 1:160, since it took 640 dilutions of the plasma before ANA was no longer detected.
A negative ANA is any number LESS than 1:80 (this is "pronounced" one to 80 parts). (Plasma was diluted 1 part plasma with 8 parts diluting solution.)
Since each dilution involves doubling the amount of test fluid, titers increase rapidly. In fact, the difference between titers of 1:160 and 1:320 is only a single dilution. And it doesn't necessarily represent a major difference in disease activity.
Lower than 1:20 is considered a negative result.
1:80 is considered a "low positive" and more tests should be ordered.
1:16 is considered positive and if SED rates and Complement tests are positive, Lupus is considered.
1:32 is a definite positive and mean the disease is active.
1:64 is considered very high and tissue damage is imminent.
I hope that I've answered your question. Please let us know if you need anything further!
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