The Albumin Serum test is a vital indicator of your overall nutritional status and liver health. Albumin is the main protein in your blood, crucial for keeping fluid from leaking out of blood vessels and for transporting hormones and nutrients. This simple blood test measures the amount of albumin in your bloodstream. Low levels can be a sign of liver disease, kidney problems, or malnutrition. This test is a core part of many health panels, providing your doctor with essential, fundamental insights into your body's internal health.