{"id":252,"date":"2026-01-31T19:14:02","date_gmt":"2026-01-31T15:44:02","guid":{"rendered":"https:\/\/gene.momeniweb.ir\/?p=252"},"modified":"2026-01-31T19:33:14","modified_gmt":"2026-01-31T16:03:14","slug":"from-amniotic-fluid-sampling-to-karyotype-reporting","status":"publish","type":"post","link":"https:\/\/gene.momeniweb.ir\/?p=252","title":{"rendered":"From Amniotic Fluid Sampling to Karyotype Reporting"},"content":{"rendered":"\n

An Educational Overview<\/p>\n\n\n\n

    \n
  1. Amniotic Fluid Sampling (Amniocentesis)
    Prenatal cytogenetic analysis begins with the collection of amniotic fluid samples, a procedure commonly performed between the 15th and 20th weeks of gestation. Under ultrasound guidance, a sterile needle is carefully inserted into the amniotic cavity to aspirate an adequate volume of fluid. This step must be carried out under strict aseptic conditions to minimize maternal and fetal risk.<\/li>\n\n\n\n
  2. Sample Transport and Initial Processing
    Following collection, the samples are transported promptly to the cytogenetics laboratory to preserve cell viability. Upon arrival, the amniotic fluid is inspected macroscopically and then centrifuged gently to separate fetal cells from the supernatant. Excessive force at this stage may compromise cellular integrity and reduce culture success rates.<\/li>\n\n\n\n
  3. Establishment of Amniotic Fluid Cell Culture
    The establishment of amniotic fluid cell cultures represents one of the most critical phases of the workflow. The isolated cells are resuspended in specific culture media supplemented with growth factors and are then incubated under controlled temperature, humidity, and CO\u2082 conditions. During the initial days, cells are allowed to adhere gradually and enter active proliferation.<\/li>\n\n\n\n
  4. Monitoring Culture Growth and Sensitivity
    Amniotic fluid cultures are highly sensitive to environmental fluctuations, particularly temperature instability and pH variation. Therefore, continuous monitoring of incubation parameters is essential throughout the culture period. Any deviation from optimal conditions may delay mitotic activity or lead to culture failure, necessitating repeat sampling.<\/li>\n\n\n\n
  5. Harvesting and Chromosome Preparation
    Once sufficient cell proliferation has been achieved, cultures are treated with mitotic inhibitors to arrest cells in metaphase. The cells are then harvested, hypotonically treated, and fixed to prepare high\u2011quality chromosome spreads. These preparations are subsequently mounted onto microscope slides for staining.<\/li>\n\n\n\n
  6. Staining and Karyotype Analysis
    Chromosome preparations are commonly stained using G\u2011banding techniques, which allow for the visualization of characteristic banding patterns. The stained metaphases are examined microscopically, and chromosomes are identified, counted, and arranged according to standardized international guidelines to generate the karyotype.<\/li>\n\n\n\n
  7. Interpretation and Reporting of Results
    The final stage involves the interpretation of cytogenetic findings and the preparation of a comprehensive laboratory report. Detected abnormalities, such as numerical or structural chromosomal alterations, are described using standard cytogenetic nomenclature. The report is then reviewed and validated before being released to the referring clinician.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    Prenatal cytogenetic analysis involves amniocentesis, laboratory processing and culture of fetal cells, careful monitoring, chromosome harvesting and staining, followed by karyotype analysis and standardized reporting of chromosomal abnormalities to clinicians.<\/p>\n","protected":false},"author":1,"featured_media":256,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[12],"tags":[],"class_list":["post-252","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genetic-tests"],"_links":{"self":[{"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=\/wp\/v2\/posts\/252","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=252"}],"version-history":[{"count":3,"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=\/wp\/v2\/posts\/252\/revisions"}],"predecessor-version":[{"id":260,"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=\/wp\/v2\/posts\/252\/revisions\/260"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=\/wp\/v2\/media\/256"}],"wp:attachment":[{"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=252"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=252"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gene.momeniweb.ir\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=252"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}