Naegele’s rule
• To the first day of the LMP, add 9 months and 7 days.
• Or subtract 3 months and add 7 days (not forgetting to add a year!).
• To be more accurate, as discussed above, add 9 days instead of 7.
• If available, use an obstetric calendar, but add an additional 2 days.
• Naegele's rule assumes a 28-day menstrual cycle.
• Ovulation occurs 14 days before menstruation; in a 28-day cycle that is day 14.
• If the woman's normal menstrual cycle is shorter or longer than this, you will need to add or subtract days accordingly. Calculate according to Naegele's rule above, then add or subtract the required days.
Examples
• For a regular 25-day cycle, subtract 3 days from the calculated expected birth date.
• For a regular 35-day cycle, add 7 days to the calculated expected birth date.
• For an irregular cycle that has no definite pattern, it is advisable to send a woman for an early dating scan, before 12 weeks of pregnancy, if this service is available; or do your best to calculate and use other clinical signs and symptoms of early pregnancy to help you.
• Remember that a woman may be quite clear that she knows exactly when she was conceived. Use this information as part of your judgment.
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• To the first day of the LMP, add 9 months and 7 days.
• Or subtract 3 months and add 7 days (not forgetting to add a year!).
• To be more accurate, as discussed above, add 9 days instead of 7.
• If available, use an obstetric calendar, but add an additional 2 days.
• Naegele's rule assumes a 28-day menstrual cycle.
• Ovulation occurs 14 days before menstruation; in a 28-day cycle that is day 14.
• If the woman's normal menstrual cycle is shorter or longer than this, you will need to add or subtract days accordingly. Calculate according to Naegele's rule above, then add or subtract the required days.
Examples
• For a regular 25-day cycle, subtract 3 days from the calculated expected birth date.
• For a regular 35-day cycle, add 7 days to the calculated expected birth date.
• For an irregular cycle that has no definite pattern, it is advisable to send a woman for an early dating scan, before 12 weeks of pregnancy, if this service is available; or do your best to calculate and use other clinical signs and symptoms of early pregnancy to help you.
• Remember that a woman may be quite clear that she knows exactly when she was conceived. Use this information as part of your judgment.
🔻Join ► https://whatsapp.com/channel/0029VaUwGkvCBtxDrc3WUK15