Descriptions of clinical laboratory tests were originally prepared for use on Lab Tests Online , an award-winning patient education website on clinical laboratory testing. Lab Tests Online is produced by the American Association for Clinical Chemistry (AACC), a global scientific and medical professional organization dedicated to clinical laboratory science and its application to healthcare. The Lab Tests Online website is developed in collaboration with other laboratory professional societies and is funded in part through corporate sponsorships.
Either bioavailable (TTBS / Testosterone, Total and Bioavailable, Serum) or free (TGRP / Testosterone Total and Free, Serum) testosterone should be used as supplemental tests to total testosterone in the above situations. The correlation coefficient between bioavailable and free testosterone (by equilibrium dialysis) is . However, bioavailable testosterone is usually the preferred test, as it more closely reflects total bioactive testosterone, particularly in older men. Older men not only have elevated SHBG levels, but albumin levels also may vary due to coexisting illnesses.
Lab Tests Online-UK is written by practising laboratory doctors and scientists to help you understand the many clinical laboratory tests that are used in diagnosis, monitoring and treatment of disease. It is produced by the Association for Clinical Biochemistry and Laboratory Medicine in collaboration with the AACC and support from the Royal College of Pathologists and the Institute of Biomedical Science. Lab Tests Online-UK was established in 2003 with the aid of a grant from the Health Foundation and was financially supported by the Department of Health. It is currently funded by the Association for Clinical Biochemistry and Laboratory Medicine, the Royal College of Pathologists and the Institute of Biomedical Science.