Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Number of repeat antinuclear antibody (ANA) tests ordered by the same practitioner, according to result and by time interval. A small proportion (0.005%–0.8%) of tests had unknown results, and, therefore, the number of positive and negative results within each time interval may not add up to the cumulative total.
