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Q&A column, 9/15

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      1. Layton JB, Li D, Meier CR, et al. Testosterone lab testing and initiation in the United Kingdom and the United States, 2000 to 2011. J Clin Endocrinol Metab. 2014;99(3):835–842.
      2. Bhasin S, Cunningham GR, Hayes FJ, et al. Testosterone therapy in men with androgen deficiency syndromes: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2010;95(6):2536–2559.
      3. Miller WG, Jones GR, Horowitz GL, Weykamp C. Proficiency testing/external quality assessment: current challenges and future directions. Clin Chem. 2011;57(12):1670–1680.
      4. College of American Pathologists Chemistry Resource Committee. Accuracy-based testosterone and estradiol. 2010. www.cap.org/apps/docs/committees/chemistry/accuracy_based_testosterone_and_estradiol.pdf. Accessed Nov. 4, 2014.
      5. Herold DA, Fitzgerald RL. Immunoassays for testosterone in women: better than a guess? [editorial]. Clin Chem. 2003;49(8):1250–1251.
      6. Taieb J, Mathian B, Millot F, et al. Testosterone measured by 10 immunoassays and by isotope-dilution gas chromatography–mass spectrometry in sera from 116 men, women, and children. Clin Chem. 2003;49(8):1381–1395.
      7. Vermeulen A, Verdonck L, Kaufman JM. A critical evaluation of simple methods for the estimation of free testosterone in serum. J Clin Endocrinol Metab. 1999;84(10):3666–3672.
      8. Moreno SA, Shyam A, Morgentaler A. Comparison of free testosterone results by analog radioimmunoassay and calculated free testosterone in an ambulatory clinical population. J Sex Med. 2010;7(5):1948–1953.

Gary L. Horowitz, MD, Medical Director, Clinical Chemistry, Beth Israel Deaconess
Medical Center, Boston, Associate Professor, Pathology, Harvard Medical School, Chair, CAP Chemistry Resource Committee, Vice Chair, CAP Accuracy-Based Testing Committee

Elizabeth A. Wagar, MD, Chair, Laboratory Medicine, University of Texas MD Anderson Cancer Center, Houston, Chair, CAP Center Committee, Member, CAP Council on Scientific Affairs, Member, CAP Board of Governors

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Dr. Kiechle is medical director of clini­cal pathology, Memorial Healthcare, Hollywood, Fla. Use the reader service card to submit your inquiries, or address them to Sherrie Rice, CAP TODAY, 325 Wau­ke­gan Road, Northfield, IL 60093; srice@cap.org. Those questions that are of general interest will be answered.

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