Amniocentesis

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Introduction

Amniocentesis.jpg Amniocentesis is a prenatal diagnostic test carried out mainly between 14th to 18th week of pregnancy (GA week 14 to 18).

In amniocentesis, 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 can be about 1 %. A recent study of the published literature, showed a procedure-related risk of miscarriage following amniocentesis was 0.35% (95% confidence interval [CI]: 0.07 to 0.63).[1]. A more detailed Cochrane review of amniocentesis and chorionic villus sampling has also bee carried out.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title This technique has not yet been fully replaced for primary screening by cell-free DNA analysis.[2]

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

Some Recent Findings

  • The yield and complications of amniocentesis performed after 24 weeks of gestation[3] "This study assessed the use and complications of late amniocentesis (AC) and analyzed factors that affect complication rate. A retrospective analysis of 167 genetic AC performed after 24 weeks during a 10-year period in two medical centers was conducted. Data regarding the indications for AC, genetic work-up, and pregnancy outcomes were retrieved from patient medical records and telephone-based questionnaires. Mean gestational age (GA) at the time of AC was 31.7 ± 2.7 weeks; 104 procedures were performed at ≤32 weeks, including 24 at ≤30 weeks. The overall pregnancy complication rate occurring at any time after the procedure was 6.6% (11). Of these, 4.8% (8) occurred within a month after AC, including 2.4% (4) that occurred within a week. An additional three occurred after 30 days. There were no differences in the total complication rate and in the rate of specific complications of procedures performed at ≤32 weeks or at ≤30 weeks. Maternal age did not affect outcomes. Genetic testing was abnormal in five cases (3%). Amniocyte culture failed in 3 cases (2.3%), with no technical failures in 52 chromosomal microarray tests. The complication rate of AC performed after 24 weeks was 4.8%, which is significantly higher than that of second trimester AC. GA and maternal age did not affect the complication rate."
  • Metabolomics of Human Amniotic Fluid and Maternal Plasma during Normal Pregnancy[4]"Metabolic profiles of amniotic fluid and maternal blood are sources of valuable information about fetus development and can be potentially useful in diagnosis of pregnancy disorders. In this study, we applied 1H NMR-based metabolic profiling to track metabolic changes occurring in amniotic fluid (AF) and plasma (PL) of healthy mothers over the course of pregnancy. AF and PL samples were collected in the 2nd (T2) and 3rd (T3) trimester, prolonged pregnancy (PP) until time of delivery (TD). ... Lactate to pyruvate ratio was decreased in AF and conversely increased in PL. The results of our study, show that metabolomics profiling can be used to better understand physiological changes of the complex interdependencies of the mother, the placenta and the fetus during pregnancy. In the future, these results might be a useful reference point for analysis of complicated pregnancies."
  • Proteomic Biomarkers in Second Trimester Amniotic Fluid That Identify Women Who Are Destined to Develop Preeclampsia[5] "Using proteomic technology, this study identified protein biomarkers that are differentially expressed in the early second trimester AF from women who subsequently develop preeclampsia compared with women who remained normotensive. Early identification of women at risk of developing preeclampsia will allow clinicians to better optimize maternal and perinatal outcomes."
  • Fatty acid composition of mid-trimester amniotic fluid in women of different ethnicities[6] "DHA did not differ among the ethnic groups or according to pregnancy outcome. A reduced palmitic acid percentage was identified in the six women with preeclampsia. ...Amniotic fluid fatty acid composition differed among the ethnic groups and may influence inflammatory mediator production and susceptibility to preeclampsia."
  • Fetal outcome and amniocentesis results in pregnancies complicated by varicella infection[7] "...In cases of varicella infection during pregnancy, negative studies of amniotic fluid using PCR may contribute to decision making."
  • Difficulties in establishing routine amniocentesis for preterm labor evaluation[8] "The predominant reasons for not performing an amniocentesis were patient refusal and provider discomfort. In conclusion, implementation of amniocentesis to evaluate for subclinical infection/inflammation in the setting of preterm labor (PTL) or preterm premature rupture of membranes (PPROM) proved difficult, as only 7 of 59 (11.9%) patients admitted with these diagnoses actually received an amniocentesis."
More recent papers  
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Search term: Amniocentesis

Peter Kozlowski, Tilo Burkhardt, Ulrich Gembruch, Markus Gonser, Christiane Kähler, Karl-Oliver Kagan, Constantin von Kaisenberg, Philipp Klaritsch, Eberhard Merz, Horst Steiner, Sevgi Tercanli, Klaus Vetter, Thomas Schramm DEGUM, ÖGUM, SGUM and FMF Germany Recommendations for the Implementation of First-Trimester Screening, Detailed Ultrasound, Cell-Free DNA Screening and Diagnostic Procedures. [Empfehlungen der DEGUM, der ÖGUM, der SGUM und der FMF Deutschland zum Einsatz von Ersttrimester-Screening, früher Fehlbildungsdiagnostik, Screening an zellfreier DNA (NIPT) und diagnostischen Punktionen.] Ultraschall Med: 2018; PubMed 30001568

Seung Mi Lee, Kyo Hoon Park, Eun Young Jung, Song Yi Kook, Hyunsoo Park, Se Jeong Jeon Inflammatory proteins in maternal plasma, cervicovaginal and amniotic fluids as predictors of intra-amniotic infection in preterm premature rupture of membranes. PLoS ONE: 2018, 13(7);e0200311 PubMed 29979758

Q Z He, X J Wu, Q Y He, J J Xiang, C H Zhang, L Lu, T Wang, H Li A method for improving the accuracy of non-invasive prenatal screening by cell-free foetal DNA size selection. Br. J. Biomed. Sci.: 2018, 75(3);133-138 PubMed 29968522

Claire N Singletary, Nevena Cvjetkovic Krstic, Jennifer L Czerwinski, Meagan Giles Choates, Chelsea Wagner Prenatal chromosomal microarray uptake with invasive prenatal diagnosis: How many patients take the leap? Prenat. Diagn.: 2018; PubMed 29966046

Winnie Huiyan Sim, Hamon Ng, Penelope Sheehan Maternal and neonatal outcomes following expectant management of preterm prelabour rupture of membranes before viability. J. Matern. Fetal. Neonatal. Med.: 2018;1-201 PubMed 29961407

Testing Comparison

A Chochrane review (2003) comparing prenatal diagnosis showed that early amniocentesis is not a safe as mid-trimester amniocentesis or chorionic villus sampling, because of increased pregnancy loss and the increased risk of Talipes equinovarus.[9]


Cells floating in the fluid can be isolated for genetic analysis and the amniotic fluid can also be often assessed for both quality and quantity. The amniotic fluid volume increases as the fetus grows and rate of change varies during the pregnancy.

  • up to 8 weeks - increases at the rate of 10 ml/week
  • 8 to 13 weeks - increases at the rate of 25 ml/week
  • 13 to 21 weeks - increases at the rate of 60 ml/week
  • 21 to 33 weeks - amniotic volume increase starts decreasing and eventually plateaus.
  • 34 weeks (GA) - peaks at about 800 mL.
  • 40 weeks (GA) - about 600 mL at term.

Fluid Facts

  • Circulated by fetal inhaling and swallowing.
  • Replaced by fetal exhalation and urination.
  • Magnesium low levels associated with preeclampsia and diabetes.
    • normal magnesium value at 16 weeks (GA) is 1.65 ± 0.16 mg/dL in amniotic fluid and 1.97 ± 0.23 mg/dL in serum.[10]

Amniotic Fluid Stem Cells

It has been shown that human amniotic fluid stem cells (hAFSCs) can be retrieved directly from a small amount of mid-term pregnancy amniotic fluid that can be obtained at the time of diagnostic amniocentesis.[3] These are generally considered as mesenchymal stem cells.


Links: Stem Cell

Movie

A typical example of ultrasound guided amniotic fluid sampling (amniocentesis) at 16 weeks of pregnancy (Royal Berkshire, Published on Oct 21, 2013).


Links: Movie - CVS | YouTube video

Historic

First used as a test of fetal sex in 1955Serr DM, Sachs L & Danon M. (1955). The diagnosis of sex before birth using cells from the amniotic fluid (a preliminary report). Bull Res Counc Isr , 5B, 137-8. PMID: 12307916 , two years later in 1957 was then published as a wider prenatal diagnostic test.[11]


References

  1. Beta J, Lesmes-Heredia C, Bedetti C & Akolekar R. (2018). Risk of miscarriage following amniocentesis and chorionic villus sampling: a systematic review of the literature. Minerva Ginecol , 70, 215-219. PMID: 29161799 DOI.
  2. Gray KJ & Wilkins-Haug LE. (2018). Have we done our last amniocentesis? Updates on cell-free DNA for Down syndrome screening. Pediatr Radiol , 48, 461-470. PMID: 29550862 DOI.
  3. 3.0 3.1 Geffen KT, Ben-Zvi O, Weitzner O, Peleg A, Biron-Shental T & Sukenik-Halevy R. (2017). The yield and complications of amniocentesis performed after 24 weeks of gestation. Arch. Gynecol. Obstet. , 296, 69-75. PMID: 28540575 DOI.
  4. Orczyk-Pawilowicz M, Jawien E, Deja S, Hirnle L, Zabek A & Mlynarz P. (2016). Metabolomics of Human Amniotic Fluid and Maternal Plasma during Normal Pregnancy. PLoS ONE , 11, e0152740. PMID: 27070784 DOI.
  5. Oh KJ, Park JS, Norwitz ER, Kim SM, Kim BJ, Park CW, Jun JK & Syn HC. (2012). Proteomic biomarkers in second trimester amniotic fluid that identify women who are destined to develop preeclampsia. Reprod Sci , 19, 694-703. PMID: 22534327 DOI.
  6. Visnjevac J, Mikić AN, Nikolić A & Visnjevac N. (2010). [Comparative analysis of amniotic fluid lamellar body count and foam stability test as indices of fetal lung maturity]. Med. Pregl. , 63, 747-52. PMID: 21553448
  7. Weisz B, Book M, Lipitz S, Katorza E, Achiron R, Grossman Z & Shrim A. (2011). Fetal outcome and amniocentesis results in pregnancies complicated by varicella infection. J Obstet Gynaecol Can , 33, 720-724. PMID: 21749748 DOI.
  8. McIntosh JJ, McHugh K & Haas DM. (2012). Difficulties in establishing routine amniocentesis for preterm labor evaluation. J. Matern. Fetal. Neonatal. Med. , 25, 313-4. PMID: 21663523 DOI.
  9. Alfirevic Z, Sundberg K & Brigham S. (2003). Amniocentesis and chorionic villus sampling for prenatal diagnosis. Cochrane Database Syst Rev , , CD003252. PMID: 12917956 DOI.
  10. Bocos Terraz JP, Izquierdo Álvarez S, Bancalero Flores JL, González López A & Escanero Marcén JF. (2011). Magnesium concentration in amniotic fluid in the early weeks of the second trimester of pregnancy. BMC Res Notes , 4, 185. PMID: 21672230 DOI.
  11. PARRISH HM, LOCK FR & ROUNTREE ME. (1957). Lack of congenital malformations in normal human pregnancies after transabdominal amniocentesis. Science , 126, 77. PMID: 13442649

Reviews

Evans MI, Wapner RJ. Invasive prenatal diagnostic procedures 2005. Semin Perinatol. 2005 Aug;29(4):215-8.

Ball RH. Invasive fetal testing. Curr Opin Obstet Gynecol. 2004 Apr;16(2):159-62.

Articles

Fajnzylber E, Hotz VJ & Sanders SG. (2010). An economic model of amniocentesis choice. Adv Life Course Res , 15, 11-26. PMID: 21516255 DOI.

Search PubMed

Search PubMed: Amniocentesis | Amniotic fluid



Prenatal Diagnosis Terms

  • blastomere biopsy - An ART preimplantation genetic diagnosis technique carried out at cleavage stage (day 3), excluding poor quality embryos, detects chromosomal abnormalities of both maternal and paternal origin. May not detect cellular mosaicism in the embryo.
  • blastocyst biopsy - An ART preimplantation genetic diagnosis technique carried out at blastocyst stage (day 4-5), removes several trophoblast (trophoderm) cells, detects chromosomal abnormalities of both maternal and paternal origin and may detect cellular mosaicism.
  • cell-free fetal deoxyribonucleic acid - (cffDNA) refers to fetal DNA circulating and isolated from the plasma portion of maternal blood.
  • false negative rate - The proportion of pregnancies that will test negative given that the congenital anomaly is present.
  • false positive rate - The proportion of pregnancies that will test positive given that the congenital anomaly is absent.
  • free β human chorionic gonadotrophin - beta-hCG subunit of hCG used as a diagnostic marker for: early detection of pregnancy, Trisomy 21, spontaneous abortion, ectopic pregnancy, hydatidiform mole or choriocarcinoma.
  • multiples of the median - (MoM) A multiple of the median is a measure of how far an individual test result deviates from the median and is used to report the results of medical screening tests, particularly where the results of the individual tests are highly variable.
  • negative predictive value - The probability that a congenital anomaly is absent given that the prenatal screening test is negative.
  • Non-Invasive Prenatal Testing - (NIPT) could refer to ultrasound or other imaging techniques, but more frequently used to describe analysis of cell-free fetal DNA circulating in maternal blood.
  • polar body biopsy - (PB biopsy) An ART preimplantation genetic diagnosis technique that removes either the first or second polar body from the zygote. As these are generated by oocyte meiosis they detects chromosomal abnormalities only on the female genetics.
  • positive predictive value - The probability that a congenital anomaly is present given that the prenatal screening test is positive.
  • pre-implantation genetic diagnosis - (PGD, pre-implantation genetic screening) a diagnostic procedure for embryos produced through Assisted Reproductive Technology (ART, in vitro fertilisation, IVF) for genetic diseases that would generate developmental abnormalities or serious postnatal diseases.
  • prenatal screening sensitivity - (detection rate) The probability of testing positive on a prenatal screening test if the congenital anomaly is present.
  • prenatal screening specificity - The probability of testing negative on a prenatal screening test if the congenital anomaly is absent.
  • single nucleotide polymorphisms - (SNPs) the variation in a single DNA nucleotide that occurs at a specific position in the genome.
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Cite this page: Hill, M.A. (2018, July 16) Embryology Amniocentesis. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Amniocentesis

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