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We report OD450 corrected for oxyhaemoglobin and a calculated bilirubin. Some years ago we stopped using the graph of Liley due to the limited range ( I think it started at 20 something weeks to 40 weeks) - transplacental transfusions can be performed from about 18 weeks and the data published by Queenan et al. Am J Obstet Gynecol 1993:168; 1370-6 is more up to date (1993 vs 1961). The test is done is exactly the same way as before but is plotted on a different graph. Michael Freemantle Biochemistry Dept Sullivan Nicolaides Pathology Taringa Ph 07 3377-8638 Fax 07 3870-5989