World Health Organization (WHO) classification of risk from contraceptive use and pregnancy in cardiovascular disease
| WHO class | Risk for contraceptive method by cardiac condition | Pregnancy risk by cardiac condition |
|---|---|---|
| WHO 1 Always useable | Risk no higher than general population | Risk no higher than general population |
| WHO 2 Broadly useable | Small increased risk; advantages of method generally outweigh risks | Small increased risk of maternal mortality and morbidity |
| WHO 3 Caution in use | Risks usually outweigh advantages of method. Other methods preferable. Exceptions if: | Significant increased risk of maternal mortality and morbidity. Expert cardiac and obstetric pre-pregnancy, antenatal and postnatal care required |
| 1. Patient accepts risks and rejects alternatives | ||
| 2. Risk of pregnancy very high and other methods less effective | ||
| WHO 4 Do not use | Method contraindicated: represents unacceptable health risk | Pregnancy contraindicated: very high risk of maternal mortality or severe morbidity. Termination should be discussed. If pregnancy continues, care as for class 3 |