What It Is. An IgA test measures the blood level of immunoglobulin A, one of the most common antibodies in the body. Antibodies are proteins made by the immune system to fight bacteria, viruses, and toxins. IgA is found in high concentrations in the body's mucous membranes, particularly the respiratory passages and gastrointestinal tract, as well as in saliva and tears. IgA also plays a role in allergic reactions.
The highest recorded closing of the Dow Jones Industrial Average, as of 2015, is 18,312.39, according to FedPrimeRate.com. The DJIA crossed the 18,000 mark for the first time in December, 2014, and reached its current record in May, 2015. Continue Reading.
The single best day. It was exactly two weeks later that Wall Street logged its biggest single-day point gain in history. The trading session on Oct. 13, 2008 added 936 points to the Dow, and injected a record $1.2 trillion back into the market value of U.S. businesses.