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.
Most flights originating from the US have a 'two piece' limit for luggage - you can check two bags, and you pay extra per bag. This applies whether the flight is domestic within the US or international. Most flights that originate from outside the US have a weight limit for total checked baggage - a miserly 20kg/44lbs if you're traveling in coach class, 30kg/66lbs for business class and 40kg/88lbs for first class.
General Checked Bag Information. If you have a bag (or multiple bags) that you donât need to have close to you during your flight, check it! Checked bags must be within 62 linear inches (thatâs length + width + depth) and no heavier than 50 pounds. Baggage that goes over these limits will be charged $75 for exceeding weight and $75 for exceeding linear inch limits. Bags will NOT be accepted if it is over 100 1b and/or over 110 linear inches.