Diagnostic Lab Tests

Our goal: for patients to reclaim their lives and feel their absolute best.

We have more than 100 Riordan Diagnostic Lab Tests, profiles and panels to meet your specific testing needs.

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Vitamin Tests

  • Lycopene

    Lycopene is a fat-soluble carotenoid. It is one of the strongest antioxidants found in the tissues and has been shown to reduce the risks of various cancers, especially prostate cancer. Foods that have the highest levels of lycopene are red tomatoes (NOT the yellow ones), catsup, tomato paste ...
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  • Vitamin E

    Vitamin E is a fat-soluble vitamin. There are eight forms of vitamin E, however, the most biologically active form is d-alpha-tocopherol. The best defined role for vitamin E is an antioxidant for unsaturated fatty acids in cell membranes. It is also important in energy metabolism and synthesis ...
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  • Vitamin D, 25-Hydroxy

    The main function of vitamin D in the body deals with calcium absorption, transport, deposition and metabolism. Decreased levels can result in symptoms involving disturbed calcium use, nerve and muscle impairment, soft or fragile bones, or if severe enough, in the classic disease called ...
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  • Vitamin C – Post IVC Plasma

    Though controversial, high dose intravenous vitamin C (ascorbic acid) has been used to effectively treat various conditions. These include various viral infections and cancer. A protocol for use of high dose vitamin C may be obtained by writing, The Riordan Clinic, 3100 N. Hillside, Wichita, KS ...
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  • Vitamin C – Plasma

    Vitamin C is also called ascorbic acid. There have been over 7000 articles written about vitamin C. It is a strong water-soluble antioxidant. Vitamin C stimulates the immune system in seven different ways and is important in collagen formation. It is important in the synthesis of connective ...
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  • Vitamin B6 – Pyridoxine

    Vitamin B6 is also called pyridoxine and erythrocyte AST/EGOT. There are three natural forms: pyridoxine (pyridoxal), pyridoxamine and pyridoxal. B6 is necessary for protein metabolism; conversion of linoleic acid to arachidonic acid; glycogen breakdown; the synthesis of brain ...
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  • Vitamin B5 – Pantothenic Acid

    This is a water-soluble vitamin that is part of the B complex. It is involved in a number of essential functions in the body and is an essential part of coenzyme A (CoA), an important catalyst in the metabolism of fats, carbohydrates and proteins in energy production. It is essential for the ...
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  • Vitamin B3 – Niacin

    Niacin, like the other B vitamins, is necessary for energy production (NAD). It is important in the synthesis of DNA, fatty acids and cholesterol. It is also important in brain function. Niacin is found in brewerÆs yeast, liver, poultry, peanuts, fish, whole grains, eggs and milk. The nicotinic ...
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  • Vitamin B2 – Riboflavin

    A deficiency of riboflavin is associated with skin problems especially around the nose, mouth, and ears. In addition, a patient may have a “”smooth tongue,”” redness, burning and excessive tearing of the eyes, light sensitivity, anemia, personality changes and cataracts. ...
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  • Vitamin B12 – Cobalamine

    B12 contains a mineral, cobalamin, and is sometimes referred to as cyancobalamin. The test is run on serum, usually in conjunction with folate (folic acid). B12 is a water-soluble vitamin. It is necessary for DNA and red blood cell synthesis, new cell growth, maintenance of nervous tissue and ...
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  • Vitamin B1 – Thiamine

    A deficiency of thiamine may result in loss of appetite, fatigue, depression, constipation, confusion, poor coordination, and nervous degeneration. The classical deficiency disease is Beri-Beri. Alcoholics often show a B1 deficiency. The RDA for thiamine is 1.2 mg. A supplemental level is 2 to ...
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  • Vitamin A

    Some of the functions of vitamin A are in the body’s vision, mucous membranes, cell division, skin maintenance, sperm production, egg development, growth, bone development and cancer prevention. Symptoms indicate a deficiency of vitamin A in the body include poor vision, night blindness, ...
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  • Folic Acid (Folate)

    Folic acid is a member of the “”B”” vitamin family and is water-soluble. The test is usually run on serum in conjunction with B12. It is necessary for new cell growth, especially the lining of the G.I. tract, the surface of the tongue and in pregnancy. It helps mobilize ...
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  • Beta Carotene

    Beta-carotene is a lipid soluble vitamin, or carotenoid. It is also known as pro-vitamin A. It is a very large molecule that is converted to vitamin A in a ratio of 1:2 beta carotene to vitamin A when it metabolized in the liver. The body will convert beta carotene to vitamin A based on its ...
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