Steroids are high molecular weight lipids consisting of a base of four fused rings that vary in their properties due to the functional groups attached to the rings. Most steroids are classified as alcohols. Others are pseudoalkaloids and the aglycone portions of saponins and cardiac glycosides. They are found in both plants and animals, can be produced synthetically and serve as precursor molecules for vitamins like vitamin D. Classes of steroids include corticosteroids produced by the adrenal glands, anabolic, androgenic, oestrogenic, progestogenic and anti-inflammatory steroids. Cholesterol is a steroid as are bile acids. Their most important function is as hormones. Sex hormones that are steroids include estrogen, testosterone and progesterone. Anabolic androgenic steroids are used by athletes to build muscle, increase body mass and reduce recovery time from injuries. These include testosterone and various synthetic alternatives. Synthetic forms of corticosteroids like prednisone are used to relieve swelling and inflammation.
17-hydroxyprogesterone is a naturally produced steroid measured in blood serum to test for adrenal steroid deficiency. It is most often measured using HPLC.
19-norandrosterone is a naturally produced steroid and a metabolite of the anabolic steroid nandrolone. It is most often measured using HPLC.
19-noretiocholanolone a metabolite of the anabolic steroid nandrolone is most frequently measured in urine of athletes tested for banned substances. It is most often measured using HPLC techniques such as LC/MS and GC/MS.
- 5b-pregnane-3a, 20a -diol -glucuronide
5b-pregnane-3a, 20a -diolglucuronide is a steroid and a progesterone metabolite most frequently measured in urine using HPLC techniques.
7-dehydrocholesterol is a cholesterol precursor that is a biochemical marker in blood plasma for the genetic defect Smith-Lemli-Optiz Syndrome. It is most often measured using GC/FID.
Cholesrerol is a steroid produced naturally and obtained from animals in the diet. Its level in the blood is associated with cardiovascular disease. It is most often measured using HPLC, GC/FID and GC/MS.
Nandrolone is a synthetic anabolic steroid prepared from 19-nortestosterone. It is most often measured using GC/MS and HPLC.
Testosterone is an anabolic steroid produced by the body and manufactured synthetically. It is most often measured using GC/MS and HPLC.