Duaa Abdulzahraa Al-Rammahi (2026) “Spectrophotometric Determination of Creatinine Using a Modified Diazo Coupling Reaction: A Reliable Approach for Biomarker Analysis in Human Serum”, American Journal of Biology and Natural Sciences, 3(2), pp. 270–280. doi: 10.51699/ajbns.v3i2.1952.