Adenosine Deaminase or ADA is an enzyme present in our body whose main function is to aid in purine metabolism. It helps in the breakdown of adenosine from our food and thereby facilitates the turnover of nucleic acids in different body tissues. Adenosine Deaminase test is to keep the immunity system developed and maintained. It is also involved in certain other minor functions such as gestation maintenance, the release of amino acids in the body, neurotransmission, and epithelial cell differentiation.