Naegele's rule is used to estimate the due date by...

Naegele's rule is used to estimate the due date by...

• A. Adding 6 months and 7 days to the LMP
• B. Subtracting 3 months from the LMP
• C. Adding 1 year and 7 days to the LMP
• D. Adding 9 months and 7 days to the LMP

Answer: (D)

Naegele's rule estimates the due date from the last menstrual period by adjusting for a typical 40-week pregnancy: add seven days, subtract three months, then add one year. This sequence is equivalent to adding nine months and seven days to the LMP. So, adding 9 months and 7 days to the LMP aligns with the rule and gives the estimated due date. The other options don’t fit because they either under-adjust, move the date backward, or overshoot the standard calculation.

Naegele's rule estimates the due date from the last menstrual period by adjusting for a typical 40-week pregnancy: add seven days, subtract three months, then add one year. This sequence is equivalent to adding nine months and seven days to the LMP. So, adding 9 months and 7 days to the LMP aligns with the rule and gives the estimated due date. The other options don’t fit because they either under-adjust, move the date backward, or overshoot the standard calculation.