Catch-up Immunization Calculator
Catch-up Immunization Calculator
When children miss scheduled vaccine doses, a catch-up immunization schedule helps them get back on track. The CDC provides specific minimum intervals between doses to ensure proper immune response while minimizing the time children remain vulnerable.
Key Principle: You never need to restart a vaccine series. The catch-up schedule picks up where the child left off, accounting for all previously administered doses.
CDC Catch-up Schedule Overview
| Vaccine | Minimum Interval | Notes |
|---|---|---|
| DTaP | 4 weeks between doses 1-3; 6 months after dose 3 | Dose 4 not needed if given after age 4 |
| IPV | 4 weeks between doses 1-2; 4 weeks after dose 2 | Dose 4 not needed if given after age 4 |
| Hib | 4 weeks between primary doses | Booster at 12-15 months |
| PCV13 | 4 weeks between primary doses | Booster at 12-15 months |
| Hepatitis B | 4 weeks between doses 1-2; 8 weeks after dose 2 | Minimum 16 weeks from dose 1 to dose 3 |
| MMR | 4 weeks between doses | Can be given with other vaccines |
| Varicella | 3 months if first dose was before 13 months | 2 doses total |
Calculator
Catch-up Immunization Calculator
Frequently Asked Questions
What is a catch-up immunization schedule?
A catch-up immunization schedule is a modified vaccine schedule for children who missed one or more recommended doses. It provides the minimum intervals between doses to get the child back on track as quickly as safely possible.
How do I calculate catch-up vaccines?
Enter the child’s date of birth and the date of the last vaccine dose. The calculator determines which vaccines are overdue and provides the minimum interval before the next dose can be given, based on CDC guidelines.
Can my child get multiple vaccines at once during catch-up?
Yes, the CDC states that getting multiple vaccines at the same time is safe and effective. During catch-up, your pediatrician may administer several vaccines in one visit to minimize the number of appointments needed.
Do I need to restart the vaccine series if we missed doses?
No, you do not need to restart any vaccine series. The CDC recommends picking up where you left off. The catch-up schedule accounts for previously administered doses and only requires the remaining doses.
Authoritative Resources
Disclaimer: This calculator is for general informational purposes only and is not a substitute for professional medical advice. Always consult your pediatrician.
