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 Dow continues upward to surpass its prior all-time record on March 5, 2013 and, by the end of 2013, sets a new all-time inflation-adjusted high for the first time since the end of 1999. Despite some significant corrections, the Dow would close above its symbolic level of 20,000 for the first time ever on January 25, 2017 and then 26,000 in less than a year on January 17, 2018.