Depending upon which part of the fetus is expected to be delivered first (fetal presentation), there are many possible positions:
- Vertex presentation with longitudinal lie:
|Left occipitoanterior||LOA||occiput, as against the buttocks, is close to the vagina (hence known as vertex presentation) faces anteriorly (forward with mother standing) and towards left. This is the most common position and lie.|
|Right occipitoanterior||ROA||occiput faces anteriorly and towards right. Less common than LOA, but not associated with labor complications.|
|Left occipitoposterior||occiput faces posteriorly (behind) and towards left.|
|Right occipitoposterior||ROP||occiput faces posteriorly and towards right.|
|Occipitoanterior||occiput faces anteriorly (absolutely straight without any turning to any of the sides)|
|Occipitoposterior||occiput faces posteriorly (absolutely straight without any turning to any of the sides)|
|Left occipitotransverse||LOT||occiput faces left|
|Right occipitotransverse||ROT||occiput faces right|
- Breech presentation with longitudinal lie:
- Left sacrum anterior (LSA)—the buttocks, as against the occiput of the vertex presentation, like close to the vagina (hence known as breech presentation), which like anteriorly and towards the left.
- Right sacrum anterior (RSA)—the buttocks face anteriorly and towards the right.
- Left sacrum posterior (LSP)—the buttocks face posteriorly and towards the left.
- Right sacrum posterior (RSP)—the buttocks face posteriorly and towards right.
- Sacrum anterior (SA)—the buttocks face anteriorly.
- Sacrum posterior (SP)—the buttocks face posteriorly.
- Shoulder presentation with transverse lie are classified into four types, based on the location of the scapula (shoulderblade); note: the presentation is significantly different to asynclitic positioning, and in most cases needs to be delivered by cesarean section.
- Left scapula-anterior (LSA)
- Right scapula-anterior (RSA)
- Left scapula-posterior (LSP)
- Right scapula-posterior (RSP)
Read more about this topic: Position (obstetrics)
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