Phenylephrine analysis is a test used to measure the levels of this compound in the blood. Phenylephrine is a widely used medication in medicine to treat low blood pressure during surgeries and also as a treatment for nasal congestion. This test can help doctors evaluate the effectiveness of the administered treatment and determine the appropriate dose, as well as monitor potential side effects. A blood sample is drawn and analyzed in a specialized laboratory, and the results are essential to ensure patient safety and treatment efficacy. This test is recommended in certain cases, especially when phenylephrine is used for extended periods or when unusual symptoms appear.