Ammonia and urea blood levels in premature infants during the first week of life were analyzed. Twenty seven blood samples from premature infants at the age of 1, 3 and 7 days were collected. The concentration of ammonia was determined using Amitest meter (TSUGAI), while the urea concentration was measured using regular techniques. Even through the ammonia levels did not exceed 180 ug/dl, the d…