- "Fetus is viable" is defined as fetus of 20 weeks AOG, weighing <>
- May be elective (planned, medical termination of pregnancy) or reproductive problem.
- Chromosomal defect
- Teratogenic factor
- Immunologic (anti phospholipid antibody)
- Faulty placental development
- Infection
- Hyperemesis
- Trauma
- Severe stress
- Disease
- Incompetent cervical Os
- Spontaneous - pregnancy ends of natural cause.
- Induced - therapeutic or elective reasons for terminating pregnancy.
- Inevitable - threatened loss that cannot be prevented.
- Incomplete - loss of some products of conception and retention of others.
- Complete - loss of all products of conception in utero after fetal death.
- Missed - retention of products of conception in utero after fetal death.
- Habitual - spontaneous abortions in three or more successive pregnancies.
- Septic - abortion due to infection.
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