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 S&P 500 has been on a tear in recent months, rising 3.54 points, to 1,923.57 on Friday â its four-month consecutive advance this year. And the Dow industrials jumped 18.43 points, to a new record of 16,717.17 â its fifth highest close in history. No doubt this high road they traversing is rarefied territory for both the S&P 500 and the Dow which, indeed, may prove acrophobic to some investors who canât take the marketâs relentless rise.