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#1
04-11-2010
 USMLE Forums Scout Steps History: Step 1 Only Posts: 14 Threads: 3 Thanked 5 Times in 4 Posts Reputation: 15
Calculation of Due Date?

What would be the formula to calculate the date if the pregnant woman used to have 34 days cycles!?

#2
04-12-2010
 USMLE Forums Guru Steps History: 1+CK+CS Posts: 339 Threads: 12 Thanked 421 Times in 143 Posts Reputation: 431
Use the Naegele's Rule

The Naegele's rule is based on a regular 28 days cycle and it estimates the EDD as follows; LMP - 3Months + 7 days.

Since your patient is have 34 days cycle then you have to add the extra days 34-28= 6 days. So the formula will be
LMP - 3 Months + 13 days.

Always remember that the luteal phase is always 14 days.
 The above post was thanked by: obgynaim (04-12-2010), rasheed (04-12-2010)

 Tags ObGyn-

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