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

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms of vitamin E deficiency, such as muscle weakness, nerve problems, or skin issues. It may also be used to monitor vitamin E levels in people with certain medical conditions, like malabsorption disorders (e.g., celiac disease, cystic fibrosis), or those taking certain medications that can affect vitamin E absorption.

What to Expect Before the Test

No special preparation is usually needed. If you’re having blood drawn, you may be asked to fast for 8–12 hours before the test, depending on your lab instructions. If you’re tested for urine or other fluids, follow any specific instructions provided by your provider.

What Happens During the Test?

Blood is drawn from a vein in your arm, and the sample is sent to a lab for analysis. For urine or other fluid tests, you may collect a sample at home or provide it during a visit. The lab measures the concentration of vitamin E in your sample using a sensitive immunoassay or similar method.

What Do the Results Mean?

Results are compared to a reference range specific to your lab, which accounts for factors like age, sex, and overall health. Low levels may signal deficiency, while high levels could indicate certain medical conditions or medications. Your provider will interpret results in the context of your health history.