After The Test & Treatment Options
After the Test
Once your specimen is submitted, results are typically processed and available within a few business days. However, processing times may vary. When ready, your results will be delivered in a clear, easy-to-understand report. If any results suggest a potential infection, you’ll receive a call from an independent healthcare coordinator. Independent physicians are also available to answer any questions or discuss your results in detail.
Treatment Options
As part of your purchase, you have the opportunity to consult with an independent physician. If appropriate, they may be able to prescribe treatment based on your test results.
Age: 18+
Must be 18+ to order blood tests.
Collection Method
In person at a location
Test Details & What It Measures
A Vitamin A test measures the level of retinol, the active form of vitamin A, in your blood. Vitamin A is essential for vision—especially night vision—and supports immune function, skin health, and the normal growth and development of cells and tissues.
Deficiency can lead to symptoms like dry eyes, night blindness, frequent infections, and in severe cases, vision loss. People at higher risk include those with malabsorption conditions (such as celiac disease, Crohn’s disease, or liver disorders), restricted diets, or chronic alcohol use.
Normal serum vitamin A levels typically range from 20 to 60 mcg/dL. Levels below 20 mcg/dL may indicate a deficiency, while excessively high levels—often from over-supplementation—can be toxic and cause symptoms such as headaches, dizziness, or liver damage. The test is usually performed with a blood sample and may be part of a broader assessment of nutritional status.
Tanumihardjo, S. A. (2011). Vitamin A: biomarkers of nutrition for development. The American Journal of Clinical Nutrition, 94(2), 658S–665S. https://doi.org/10.3945/ajcn.110.005777
