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===[[First trimester abortion|Abortion]] Types===
{| class="wikitable"
! style="font-weight: bold;" | Classification
! style="font-weight: bold;" | Characteristics
! style="font-weight: bold;" | OS
! style="font-weight: bold;" | Fetal Tissue Passage
! style="font-weight: bold;" | Misc
|-
| Threatened
| Abdominal pain or bleeding; < 20 weeks gestation
| Closed
| No
| If  < 11 weeks (with fetal cardiac activity) 90% progress to term.  If between 11 and 20 weeks 50% progress to term
|-
| Inevitable
| Abdominal pain or bleeding; < 20 weeks gestation
| Open
| No
| 
|-
| Incomplete
| Abdominal pain or bleeding; < 20 weeks gestation
| Open
| Yes, some
| 
|-
| Complete
| Abdominal pain or bleeding; < 20 weeks gestation
| Closed
| Yes, complete expulsion of products
| Distinguish from ectopic based on decreasing hCG and/or decreased bleeding
|-
| Missed
| Fetal death at <20 weeks without passage of any fetal tissue for 4 weeks after fetal death
| Closed
| No
| 
|-
| Septic
| Infection of the uterus during a miscarriage.  Most commonly caused by retained products of conception
| Open
| No, or may be incomplete
| Uterine tenderness and purulent discharge from the OS may be present
|}