Serum complement levels in recurrent aphthous ulceration. An intraindividual pilot study of sequential C3, C4 & C1 esterase inhibitor estimations.

No alterations on different occasions in serum complement levels could be detected in patients suffering from recurrent aphthous stomatitis. General laboratory tests were also normal and these findings are further evaluated in the discussion. It was also found that it is possible to store serum at very low temperature for months and still carry out rather sofisticated laboratory analysis.