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I don't actually have a sheet available but am going through a similar process preparing a letter to our GPs as we change to a lower sensitivity kit (25mU/L bhCG) from our "normal" sensitivity (200mU/L). I have found these references quite useful; Wang et al, Fert. Ster.79 (3) 2003, p577-84. Concenption, early pregnancy loss and time to clinical pregnancy: a population based prospective study. Wilcox et al, JAMA 286 (14) 2001, p 1759-61. Natural limits of pregnancy testing in relation to the expected menstrual period. Hope you find them useful too! Dr Fiona Ivison Dept. of Clinical Chemistry Royal Liverpool University Hospital 4th Floor Duncan Building Liverpool L7 8XP 0151 706 4287 _________________________________________________________________ On the move? Get Hotmail on your mobile phone http://www.msn.co.uk/msnmobile