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.
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 classost airlines now charge extra for suitcases weighing more than 50lbs whereas until a few years back they d carry suitcases weighing up to 70 lbs with no surcharge and if you re lucky they will allow two free pieces of luggage whereas before you d often be allowed three