The Vitamin E test is used to check if one's body is absorbing vitamin E properly, is getting enough vitamin E in a diet and the status of vitamin E in premature babies. This test is prescribed if one has muscle weakness, slow reflexes, skin problems, vision problems and unsteady walking. A Vitamin E test is an essential diagnostic test because the deficiency of vitamin E can lead to several disorders that are vital to detect to get treatment at the right time. Further, vitamin E deficiency can lead to numbness and tingling in the hands and feet when the nerves in those areas become weak.