Albumin The most common protein found in the blood. It is used by the body for growth and tissue repair. Related Articles: Glossary: AlbuminuriaALTERNATIVE MARKERS FOR BLOOD GLUCOSE MONITORINGGlossary: Urine TestsGlossary: Albumin to Creatinine RatioEpisode 23: Diabetes & the Prevention of Kidney Disease