Important: VAERS reports alone cannot determine if a vaccine caused an adverse event. Reports may contain incomplete, inaccurate, or unverified information. Correlation does not equal causation.
Haematocrit decreased appears in 1,848 VAERS reports across all vaccines. Of these, 167 reports also mentioned death and 1,208 involved hospitalization. The severity rate (deaths + hospitalizations as a percentage of reports) is 74.4%. The top vaccines associated with this symptom are COVID-19, Rotavirus (RotaTeq), Hib. Remember: VAERS reports show temporal association, not causation.
Haematocrit decreased has been reported 1,848 times in VAERS from 1990 to 2026.
Of these reports, 167 were associated with death (9.04%) and 1,208 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Haematocrit decreased is 74.4%.
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.