A client plans to try to conceive in 3 months. The client already takes a daily prenatal vitamin containing 0.8 mg of folic acid. The client's cousin was born with spina bifida, and the client's second pregnancy was ended at 18 weeks after an ultrasound showed anencephaly. Which teaching should the nurse provide?

Quick answer
Add a separate 4 mg folic acid tablet now, as prescribed.

Why this is correct
The stem contains two NTD details, and only one sets the dose. The cousin with spina bifida is a distant relative, but the client's own pregnancy affected by anencephaly is the highest-risk history, which calls for 4 mg daily beginning before conception. The prenatal vitamin continues, and the extra folic acid is given as its own tablet rather than by taking more multivitamins.

Easy analogy or mental picture
Risk sets the dose like a thermostat: average risk is the normal setting, a distant relative nudges it slightly, and a previous affected pregnancy turns it up high before the pregnancy starts.

Memory hook
Own prior NTD pregnancy = 4 mg, starting BEFORE conception, as a separate tablet.

NCLEX decision rule
When a stem gives more than one risk factor, identify which one places the client in the highest risk category and teach for that category.

Why the other choices are wrong
Continuing the 0.8 mg vitamin is tempting because it already exceeds the routine 0.4 mg advice, but that advice is for average-risk clients. Adding 4 mg after a positive test uses the right dose too late, because the neural tube closes about 4 weeks after conception, often before a pregnancy is recognized. A 1 mg supplement is a moderate-risk option used for a more distant family history such as the cousin, but the client's own affected pregnancy outweighs it.