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.
Personal Items. Most airlines allow you to bring one personal item such as a briefcase or purse and one larger carry-on bag -- most airlines have a maximum size of 9 by 14 by 22 inches -- though you may also opt to check luggage. Contact your airline to find out about checked-bag fees and size limits.lectronics. Personal electronics are allowed in either your checked or carry-on luggage. In fact, it might be preferable for you to keep items such as laptops, MP3 players, video cameras and video game systems with you, because checked baggage might be jostled quite a bit as it's loaded onto and off the plane.