We report the numerical OD450 value and an interpretation. We also enclose a chart of gestation (x) against OD450 (y) which has Liley's zones and Whitfield's action line printed on it. The result(s)is plotted on this chart. Kind regards Ian Holbrook Department of Chemical Pathology York District Hospital Wigginton Road YORK YO31 8HE UK _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.