Which statement about MMR dosing timing is true?

Which statement about MMR dosing timing is true?

• A. The dose must be given exactly at the recommended age.
• B. Doses may be given 4 days prior to or after the minimum interval or age.
• C. If a dose is given early, you should repeat the entire series.
• D. If the dose is given early, you should reduce the dose.

Answer: (B)

Dosing timing for MMR relies on a short grace period around the recommended ages and intervals, so a dose can still count even if it isn’t given exactly on the day of the schedule. The idea is to accommodate real‑world scheduling without compromising protection. The statement that is true reflects this flexibility: a vaccine dose may be given up to 4 days before the minimum age or interval and still count toward the series, and it can be given after the minimum age or interval as planned. This means minor scheduling shifts don’t require restarting the entire series, and you don’t need to adjust the dose amount because of a small timing variation. The other options imply rigid timing, mandatory restart, or dose reduction, which aren’t how MMR timing is handled in practice.

Dosing timing for MMR relies on a short grace period around the recommended ages and intervals, so a dose can still count even if it isn’t given exactly on the day of the schedule. The idea is to accommodate real‑world scheduling without compromising protection.

The statement that is true reflects this flexibility: a vaccine dose may be given up to 4 days before the minimum age or interval and still count toward the series, and it can be given after the minimum age or interval as planned. This means minor scheduling shifts don’t require restarting the entire series, and you don’t need to adjust the dose amount because of a small timing variation.

The other options imply rigid timing, mandatory restart, or dose reduction, which aren’t how MMR timing is handled in practice.