The nurse should teach a pregnant woman that which substances are teratogens? (Select all that apply.).

To calculate the estimated date of confinement (EDC) using Nagele's rule, follow these steps:

1. Take the first day of the last menstrual period (LMP).

2. Add 7 days to that date.

3. Count back 3 months.

4. Add 1 year to the resulting date, and that will be the EDC.

In this case, the client's LMP started on December 1.

1. December 1

2. December 8 (adding 7 days)

3. September 8 (counting back 3 months)

4. Add 1 year: September 8 of the following year

So, the most accurate EDC for the client using Nagele's rule would be September 8 of the following year.

Choice A rationale:

Ribbon-like stools are more characteristic of conditions like irritable bowel syndrome (IBS) or colorectal cancer, not intussusception. Intussusception is a medical emergency where one segment of the intestine telescopes into another, leading to obstruction and potentially compromised blood flow.

Choice B rationale:

Hard stools positive for guaiac are suggestive of constipation and are not specific to intussusception. In intussusception, the stool characteristics are usually not relevant to the diagnosis as the condition primarily involves intestinal obstruction.

Choice C rationale:

"Currant jelly" stools are a classic characteristic of intussusception. These stools contain mucus and blood and have a characteristic appearance due to the compromised blood flow and tissue damage in the intestines. Recognizing this stool description is crucial for identifying a potential case of intussusception.

Choice D rationale:

Loose, foul-smelling stools are not specific to intussusception. These symptoms could be indicative of various gastrointestinal issues but are not directly associated with the classic presentation of intussusception, which involves the passage of bloody mucus in the stool.