Color and transparency are determined from visual observation of the sample. Normal urine is straw yellow to amber in color. Abnormal colors include bright yellow, brown, black (gray), red, and green. These pigments may result from medications, dietary sources, or diseases.
limulus amebocyte lysate test. limulus amebocyte lysate test. LAL test. A test used to detect minute quantities of bacterial endotoxins and to test for pyrogens in various materials; it is also used to detect septicemia due to gram-negative bacteria. Limulus amebocyte lysate is formed from the lysed circulating amebocytes of the horseshoe crab (Limulus polyphemus).
âGuideline on Validation of the Limulus Amebocyte Lysate Test as an End-product. Test for Human and Animal Parenteral Drugs, Biological Products, and Medical. Devices,â which was issued in 1987. Elements of the Guideline continue to impact. current methods because they can be found in other references relied on by the. industry.