Vitamin A is needed by the retina of the eye in the form of a specific metabolite, the light-absorbing molecule retinal, which is absolutely necessary for both low-light (scotopic vision) and color vision. Vitamin A also functions in a very different role, as an irreversibly oxidized form of retinol known as retinoic acid, which is an important hormone-like growth factor for epithelial and other cells.
Preparation for Your Test
- Wear a short sleeved shirt or a shirt with sleeves that roll up easily.
The cost of this test is $26.
Click here to review and print the Disclaimer and Consent form. Please bring these completed forms with you to your appointment.*
*Note: These forms are available as printable PDF files using Adobe Acrobat. If you do not already have an Adobe Acrobat Reader, download a free copy now from Adobe Acrobat.
For detailed information regarding this lab test visit http://www.labtestsonline.org/.