Most commonly, rheumatoid factor is used as a blood test for the diagnosis of rheumatoid arthritis. Rheumatoid factor is present in about 80% of adults (but a much lower proportion of children) with rheumatoid arthritis. In people with rheumatoid arthritis, high levels of rheumatoid factor can indicate a tendency toward more aggressive disease and/or a tendency to develop rheumatoid nodules and/or rheumatoid lung disease.
The City of Opa-locka had a population of 16,683 as of July 1, 2017. Opa-locka ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Florida. See peer rankings below. The primary coordinate point for Opa-locka is located at latitude 25.9 and longitude -80.2552 in Miami-Dade County. The formal boundaries for the City of Opa-locka (see map below) encompass a land area of 4.3 sq. miles and a water area of 0.18 sq. miles.
Miami Springs, City of Opa-locka City Hall, Opa-locka Tri-Rail Station, City of Hialeah, East 8 Avenue (LeJeune Road), Amtrak Passenger Terminal, Tri-Rail Metrorail station, Miami International Airport (MIA) Metrorail station, City of Coral Gables and the Douglas Road Metrorail station.