n. 1  A nucleic acid that carries the genetic information in cells and some viruses, consisting of two long chains of nucleotides twisted into a double helix and joined by hydrogen bonds between the complementary bases adenine and thymine or cytosine and guanine.
Less than 1 percent of patients with normal results on liver function tests before taking extended-release niacin tablets have elevated liver enzyme values (more than three times the reference range) after niacin is started.
Elevated liver enzymes may be discovered during routine blood testing. In most cases, liver enzyme levels are only mildly and temporarily elevated. Most of the time, elevated liver enzymes don't signal a chronic, serious liver problem. 1  Causes.