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Obstetric definitions

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Anaesthetics and Critical Care

Obstetrics Gynaecology

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Urology

Version Jan 2023

The first stage of labour This is from onset of regular and painful contractions until the cervix is fully dilated
The second stage of labour This is from full dilation of the cervix until the delivery of the baby
The third stage This is from delivery of the baby until delivery of the placenta
Presentation This is that part of the fetus that lies in the lower segment of the uterus
Presenting part This is that lowest part of the fetus palpable on vaginal examination
Position of the fetus This is the relationship of the presenting part relative to the maternal pelvis with reference to what is called the denominator e.g. in a cephalic presentation it is the occiput and in a breech presentation the fetal sacrum e.g. OA occipitoanterior, sacroposterior
Engagement This is when the widest diameter of the fetal presenting part enters the maternal pelvis
Moulding This is the reduction in diameter of the fetal head caused by the coming together and even overlapping of fetal skull sutures as the head is compressed by the maternal pelvis
Caput This is the localised swelling of the fetal scalp due to pressure during labour

PLEASE NOTE LEGAL ADVICE: The contents are under continuing development and improvements and may contain errors of omission or fact. The official launch will be at the end of 2018. Feedback vital and always welcome at drokane at gmail.com. This is not to be used for the assessment, diagnosis or management of patients. It should not be regarded as medical advice. It is only for educational purposes. Please adhere to your local protocols. If you are unwell please seek healthcare advice from your doctor. This does not replace senior or specialist advice. If you do not accept this then please do not use the website. If you need medical advice, please consult a doctor or other appropriate medical professional. If you are a medical professional and you need advice then speak to your senior or colleagues.

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The first stage of labour	This is from onset of regular and painful contractions until the cervix is fully dilated
The second stage of labour	This is from full dilation of the cervix until the delivery of the baby
The third stage	This is from delivery of the baby until delivery of the placenta
Presentation	This is that part of the fetus that lies in the lower segment of the uterus
Presenting part	This is that lowest part of the fetus palpable on vaginal examination
Position of the fetus	This is the relationship of the presenting part relative to the maternal pelvis with reference to what is called the denominator e.g. in a cephalic presentation it is the occiput and in a breech presentation the fetal sacrum e.g. OA occipitoanterior, sacroposterior
Engagement	This is when the widest diameter of the fetal presenting part enters the maternal pelvis
Moulding	This is the reduction in diameter of the fetal head caused by the coming together and even overlapping of fetal skull sutures as the head is compressed by the maternal pelvis
Caput	This is the localised swelling of the fetal scalp due to pressure during labour