Serum or plasma concentration of vitamin E (alpha-tocopherol)

Why Is This Test Done?

Your healthcare provider may order this test to check for vitamin E deficiency, especially if you have symptoms like muscle weakness, nerve problems, or a history of certain medical conditions that affect fat absorption. It can also be part of routine blood work or screening for genetic disorders.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it involves drawing blood from a vein. If it’s a urine test, you might need to collect a sample over 24 hours. Always follow your provider’s instructions.

What Happens During the Test?

For blood tests, a healthcare professional will insert a needle into a vein (often in your arm) to draw a small amount of serum or plasma. For urine tests, you’ll collect a sample in a container over a specified period. The sample is then sent to a lab for analysis.

What Are Possible Results?

Results are reported as a concentration (e.g., milligrams per deciliter). Your provider will compare your result to standard reference ranges and discuss it with you based on your health history and symptoms.