Journal Article Modified Zinc Analysis Method and Serum and Urinary Zinc Levels in Control Subjects Get access Harold L. Helwig, Ph.D., Harold L. Helwig, Ph.D. Division of Laboratories, California State Department of Public Health, Berkeley, California Search for other works by this author on: Oxford Academic Google Scholar Emanual M. Hoffer, B.A., Emanual M. Hoffer, B.A. Division of Laboratories, California State Department of Public Health, Berkeley, California Search for other works by this author on: Oxford Academic Google Scholar William C. Thielen, A.A., William C. Thielen, A.A. Division of Laboratories, California State Department of Public Health, Berkeley, California Search for other works by this author on: Oxford Academic Google Scholar Arthur E. Alcocer, A.B., Arthur E. Alcocer, A.B. Division of Laboratories, California State Department of Public Health, Berkeley, California Search for other works by this author on: Oxford Academic Google Scholar David R. Hotelling, B.A., David R. Hotelling, B.A. Division of Laboratories, California State Department of Public Health, Berkeley, California Search for other works by this author on: Oxford Academic Google Scholar William H. Rogers, B.S. William H. Rogers, B.S. Division of Laboratories, California State Department of Public Health, Berkeley, California Search for other works by this author on: Oxford Academic Google Scholar American Journal of Clinical Pathology, Volume 45, Issue 2, 1 February 1966, Pages 160–165, https://doi.org/10.1093/ajcp/45.2.160 Published: 01 February 1966 Article history Received: 28 June 1965 Published: 01 February 1966