Formulas & normal valuesFree in the app
Mortality & rate definitions
For audits, exams and teaching.
Source: WHO · MBRRACE-UKTerm
| Maternal mortality ratio | Maternal deaths per 100,000 live births (WHO) or maternities (UK). |
|---|---|
| Maternal death | During pregnancy or within 42 days, from pregnancy-related causes. |
| Late maternal death | 42 days to 1 year after pregnancy. |
| Stillbirth (UK) | Baby born with no signs of life ≥24+0 weeks. |
| Perinatal mortality | Stillbirths + deaths in first 7 days per 1000 total births. |
| Neonatal mortality | Deaths in first 28 days per 1000 live births. |
| Pearl index | Pregnancies per 100 woman-years of use. |
| Caesarean rate | Compare using Robson groups. |
A summary for trained clinicians. Always check the full guideline, the patient in front of you and your hospital's protocol. Spotted an error? Tell us.