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.
Stocks have never been higher. The Dow is higher than it's ever been before. The Dow jumped 121 points to 18,348 on Tuesday, surpassing the previous record set in May 2015 and joining the S&P 500 in uncharted territory. And for the first time this year, even the Nasdaq closed in positive territory for 2016. All of this represents a breakthrough for U.S. markets.