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.
How many pieces/kilos of luggage can I check in? To be able to take your luggage free of charge, you must ensure that you meet the following size and weight regulations: - The sum of each piece of luggage must not exceed 158 cm/62 in including the strap, pocket and wheels. - A maximum weight of 23 kg/50 lbs (you may check in between 23kg/50lbs and 32Kg/70.5 lbs with an overweight charge).Avoid paying the excess weight fee at the airport reserving for an extra suitcase. The number of pieces that you can take free of charge will depend on the destination and class in which you are flying.