The TwoDay algorithm: A new algorithm to identify the fertile time of the menstrual cycle

Women who monitor their fertility signs and recognize when they are fertile can use this knowledge to conceive or to avoid pregnancy. Studies have sho wn that there is a rather small fertile window of several days during each menstrual cycle. Established methods of identifying the fertile window, suc h as the Ovulation and the Symptothermal methods of Natural Family planning can be very effective in helping couples avoid pregnancy. A new algorithm for identifying the fertile window has been developed, based on monitoring and recording of cervical secretions. The TwoDay Algorithm appears to be si mpler to teach, learn, and use than current natural methods. A large existi ng data set from a World Health Organization study of the Ovulation Method, along with Natural Family Planning charts from women using the Ovulation M ethod and the Symptothermal Method, were used to determine the potential ef fectiveness of the TwoDay Algorithm in identifying the fertile window. Resu lts suggest that the algorithm can be an effective alternative for low lite racy populations or for programs that find current Natural Family Planning methods too time consuming or otherwise not feasible to incorporate into th eir services. Further studies are needed to determine the efficacy of the T woDay Algorithm in avoiding pregnancy and to assess its acceptability to us ers and providers. CONTRACEPTION 1999;60: 65-70 (C) 1999 Elsevier Science I nc. All rights reserved.