Is an elevated white blood cell count possible after dtap/hib vaccine?

Mild increase = yes. Any stress can trigger an increase in adrenal stress hormone levels. This cortisol can drive white cells off their resting place on the inside walls of blood vessels producing a transient rise in the total white count when they enter the circulation. The effect is transient.

Related Questions

Elevated white blood cell count possible after dtap/hib vaccine, shoudl I be concerned?

Not necesarily. The shots will stimulate a non specific stress response and can transiently double the WBC count. It usually settles down within a day. The differential pattern of such a reaction shows a pattern of mature rather than new white cells.

Elevated white blood cell count possible after Hib vaccine?

Mild increase = yes. Any stress can trigger an increase in adrenal stress hormone levels. This cortisol can drive white cells off their resting place on the inside walls of blood vessels producing a transient rise in the total white count when they enter the circulation. The effect is transient.