BGDA Practical Placenta - Diagnostic Techniques: Difference between revisions

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{{Template:Prenatal diagnosis}} | [[Placenta_-_Membranes#Amnionic_Sac|Placenta - Amnionic Sac]]
{{Template:Prenatal diagnosis}} | [[Placenta_-_Membranes#Amnionic_Sac|Placenta - Amnionic Sac]]
==Placenta Term Parameters==
[[File:Placental_volume_graph.jpg|thumb|400px|Human term placental volumes sorted by size (from table).]]
Term placental composition, villous capillarization and the mean cross-sectional areas of peripheral villi and capillaries, data from a study sample of 15 normal placenta (mean placental volume, 652 ml). <ref><pubmed>19141109</pubmed></ref>
{|
|-bgcolor="CEDFF2"
| width="150px"|'''Variable'''
| '''Unit'''
| '''Placenta''' (mean, n = 15)
|-
|Intervillous space
| mL
| 213
|-bgcolor="F5FAFF"
| Stem villi
| mL
| 71.4
|-
| Peripheral villi
| mL
| 326
|-bgcolor="F5FAFF"
| Trophoblast
| mL
| 95.5
|-
| Stroma
| mL
| 184
|-bgcolor="F5FAFF"
| Fetal capillaries
| mL
| 46.9
|-
| Non-parenchyma
| mL
| 41.5
|-bgcolor="F5FAFF"
| Peripheral villi
| km
| 89.2
|-
| Fetal capillaries
| km
| 310
|-bgcolor="F5FAFF"
| TS area villi
| µm<sup>2</sup>
| 3700
|-
| TS area capillary
| µm<sup>2</sup>
| 150
|-bgcolor="F5FAFF"
| Capillaries
| mL mL<sup>-1</sup>
| 0.147
|-
| Length ratio
| km km<sup>-1</sup>
| 3.6
|-bgcolor="F5FAFF"
|}
<references/>


==Terms==
==Terms==

Revision as of 19:26, 29 May 2012

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Practical 14: Implantation and Early Placentation | Villi Development | Maternal Decidua | Cord Development | Placental Functions | Diagnostic Techniques | Abnormalities



Fetus in Utero Between fifth and sixth months


Chorionic Villus Sampling

Cvs.jpg Chorionic Villus Sampling test is done in the 10th to 12th week after the first day of the mother's last menstrual period. The test is done by looking at cells taken from the chorionic membrane or placenta. No anaesthetic is required, and a test result is usually available in two to three weeks.

When the test is carried out by an obstetrician experienced in the technique, the risk of miscarriage related to the test is about 2%.

Potential disadvantages include maternal cell contamination, placental mosaicism and failure to obtain an adequate specimen. This may result in the need for a repeat procedure or amniocentesis.


Links: Chorionic villus sampling

Amniocentesis

Amniocentesis.jpg Amniocentesis is a prenatal diagnostic test carried out mainly between 14th to 18th week of pregnancy. Amniotic fluid is taken from the uterus, sent to a diagnostic laboratory and embryonic cells isolated from the amniotic fluid. No anaesthetic is required, and a result is usually obtained in about three to four weeks. When the test is carried out by an obstetrician experienced in the technique, the risk of a miscarriage related to the test is about 1 %.


Links: Amniocentesis


Diagnosis Links: Prenatal Diagnosis | pregnancy test | amniocentesis | chorionic villus sampling | ultrasound | Alpha-Fetoprotein | Pregnancy-associated plasma protein-A | Fetal Blood Sampling | Magnetic Resonance Imaging | Computed Tomography | Non-Invasive Prenatal Testing | Fetal Cells in Maternal Blood | Preimplantation Genetic Screening | Comparative Genomic Hybridization | Genome Sequencing | Neonatal Diagnosis | Category:Prenatal Diagnosis | Fetal Surgery | Classification of Diseases | Category:Neonatal Diagnosis

| Placenta - Amnionic Sac

Placenta Term Parameters

Human term placental volumes sorted by size (from table).

Term placental composition, villous capillarization and the mean cross-sectional areas of peripheral villi and capillaries, data from a study sample of 15 normal placenta (mean placental volume, 652 ml). [1]

Variable Unit Placenta (mean, n = 15)
Intervillous space mL 213
Stem villi mL 71.4
Peripheral villi mL 326
Trophoblast mL 95.5
Stroma mL 184
Fetal capillaries mL 46.9
Non-parenchyma mL 41.5
Peripheral villi km 89.2
Fetal capillaries km 310
TS area villi µm2 3700
TS area capillary µm2 150
Capillaries mL mL-1 0.147
Length ratio km km-1 3.6


  1. <pubmed>19141109</pubmed>

Terms

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Cite this page: Hill, M.A. (2024, May 13) Embryology BGDA Practical Placenta - Diagnostic Techniques. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/BGDA_Practical_Placenta_-_Diagnostic_Techniques

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G