A woman discovers she is pregnant on September 20 and reports her LMP was July 1. Using calculation, determine how many completed weeks pregnant she is (to one decimal) and whether neural tube closure (which occurs around 6 weeks post-LMP) has already occurred. Show calculations.

• A. Approximately 15.3 weeks; neural tube closure occurs at 20 weeks so it has not yet occurred.
• B. Approximately 4.0 weeks; neural tube closure occurs later and will occur in the second trimester.
• C. Approximately 8.2 weeks; neural tube closure has not yet occurred.
• D. Approximately 11.7 weeks; neural tube closure (~6 weeks) has already occurred.

Answer: (D)