The Vitamin B4 by HPLC test is a laboratory procedure used to measure the levels of Vitamin B4 (also known as Adenosine) in the blood. Vitamin B4 plays an important role in metabolism and energy production within the body. A blood sample is collected and sent to a laboratory, where it is analyzed using High-Performance Liquid Chromatography (HPLC). This technique allows for highly accurate and precise measurement of the vitamin concentration. This test is recommended in cases of malnutrition or when symptoms such as persistent fatigue or difficulty concentrating appear. The results help doctors assess the patient's nutritional status and determine if supplementation or dietary changes are needed to ensure healthy levels of Vitamin B4, thereby supporting energy production and overall health.