RT Journal Article SR Electronic T1 Serum alpha-thiol protease inhibitor concentrations in health and disease. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 221 OP 225 DO 10.1136/jcp.40.2.221 VO 40 IS 2 A1 J R Webb A1 E H Cooper A1 M A Forbes YR 1987 UL http://jcp.bmj.com/content/40/2/221.abstract AB Serum alpha-thiol protease inhibitor (alpha-TPI) concentration was assayed by radial immunodiffusion in normal subjects, pregnant women, and in a wide variety of diseases. The normal concentration (448 (SD 75) mg/l) increased significantly (p less than 0.001) in pregnancy to 575 (89) mg/l, and in prostatic cancer treated by oestrogens to 666 (87) mg/l. Inconsistent changes were observed in inflammatory and malignant disease and in liver disease. A temporary pronounced fall of alpha-TPI was seen after burn injury, and a sustained fall after bone marrow transplantation. Crossed immunoelectrophoresis showed that the serum alpha-TPI occurred in two forms, with alpha 2 and alpha 1 electrophoretic mobilities. A heavy demand on this antiprotease may result in suppression of the alpha 1 form.