{"id":2494,"date":"2009-03-08T17:33:30","date_gmt":"2009-03-08T17:33:30","guid":{"rendered":"https:\/\/medicalcriteria.com\/web\/hemet\/"},"modified":"2025-05-14T19:09:56","modified_gmt":"2025-05-14T19:09:56","slug":"hemet","status":"publish","type":"post","link":"https:\/\/medicalcriteria.com\/web\/hemet\/","title":{"rendered":"Diagnostic Criteria for Essential Thrombocytopaenia (ET)"},"content":{"rendered":"<div class=\"99c380e4b4a7b96c35d7ddf7dcb434e8\" data-index=\"1\" style=\"float: none; margin:0px 0 0px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<!-- MC 2019- Horizontal -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-0127150553352455\"\r\n     data-ad-slot=\"3806776041\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p><\/p>\n<div class=\"Section1\">\n<p class=\"MsoNormal\"><strong> Polycythemia Vera Study Group (PVSG) Diagnostic Criteria for Essential Thrombocytopaenia (ET)<\/strong><\/p>\n<p class=\"MsoNormal\">All of the following criteria must be fulfilled to make a diagnosis of ET<\/p>\n<ol>\n<li>\n<p class=\"MsoNormal\" style=\"margin-top: 0pt; margin-bottom: 0pt;\">Platelet count greater than 600 x 10<sup>9<\/sup>\/L<\/p>\n<\/li>\n<li>\n<p class=\"MsoNormal\" style=\"margin-top: 0pt; margin-bottom: 0pt;\">Hematocrit less than 40 or normal red blood cell mass<\/p>\n<\/li>\n<li>\n<p class=\"MsoNormal\" style=\"margin-top: 0pt; margin-bottom: 0pt;\">Stainable iron in the marrow or normal RBC mean corpuscular volume (If these measurements suggest iron deficiency, polycythemia vera cannot be excluded unless a trial of iron therapy fails to increase the red blood cell mass into the polycythemic range.)<\/p>\n<\/li>\n<li>\n<p class=\"MsoNormal\" style=\"margin-top: 0pt; margin-bottom: 0pt;\">No Philadelphia chromosome or <em> bcr\/abl<\/em> gene rearrangement<\/p>\n<\/li>\n<li>\n<p class=\"MsoNormal\" style=\"margin-top: 0pt; margin-bottom: 0pt;\">Collagen fibrosis of the bone marrow absent or less than one third of the biopsy area without both marked splenomegaly and a leukoerythroblastic blood film<\/p>\n<\/li>\n<li>\n<p class=\"MsoNormal\" style=\"margin-top: 0pt; margin-bottom: 0pt;\">No cytogenetic or morphologic evidence for a myelodysplastic syndrome<\/p>\n<\/li>\n<li>\n<p class=\"MsoNormal\" style=\"margin-top: 0pt; margin-bottom: 0pt;\">No cause for a reactive thrombocytosis<\/p>\n<p><!--more--><\/p>\n<p class=\"MsoNormal\" style=\"margin-top: 0pt; margin-bottom: 0pt;\">\n<\/li>\n<\/ol>\n<p class=\"MsoNormal\"><strong>WHO Diagnostic Criteria for Essential Thrombocytopaenia (ET)<\/strong><\/p>\n<p class=\"MsoNormal\">Positive criteria<\/p>\n<ol>\n<li>Sustained platelet count &gt; 600x 10<sup>9<\/sup>\/l<\/li>\n<li>Bone marrow biopsy specimen showing proliferation mainly of the megakaryocytic lineage with increased numbers of enlarged, mature megakaryocytes<\/li>\n<\/ol>\n<p class=\"MsoNormal\">Criteria of exclusion<\/p>\n<ol>\n<li>No evidence of polycythaemia vera (PV)\n<ul>\n<li>Normal red cell mass or Hb &lt;18.5 g\/dl in men, 16.5g\/dl in women<\/li>\n<li>Stainable iron in marrow, normal serum ferritin or normal mean corpuscular volume (MCV)<\/li>\n<li>If the former is not met, failure of iron trial to increase red cell mass or hemoglobin levels to the PV range<\/li>\n<\/ul>\n<\/li>\n<li>No evidence of CML\n<ul>\n<li>No evidence of Philadelphia chromosome and no BCR\/ABL fusion gene<\/li>\n<\/ul>\n<\/li>\n<li>No evidence of idiopathic myelofibrosis\n<ul>\n<li>Collagen fibrosis absent<\/li>\n<li>Reticulin fibrosis minimal or absent<\/li>\n<\/ul>\n<\/li>\n<li>No evidence of myelodysplastic syndrome\n<ul>\n<li>No del(5q), t(3;3)(q21;26), inv(3)(q21q26)<\/li>\n<li>No significant granulocytic dysplasia; few, if any, micromegakaryocytes<\/li>\n<\/ul>\n<\/li>\n<li>No evidence that thrombocytosis is reactive due to:\n<ul>\n<li>Underlying inflammation or infection<\/li>\n<li>Underlying neoplasm<\/li>\n<li>Prior splenectomy<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p class=\"MsoNormal\">\n<\/div>\n<div class=\"Section1\"><\/div>\n<div class=\"Section1\">\n<div class=\"Section1\">\n<div class=\"Section1\">\n<div class=\"Section1\">\n<p class=\"MsoNormal\"><strong>References:<\/strong><\/p>\n<ol>\n<li class=\"MsoNormal\">Imbert M, Pierre R, Thiele J, Vardiman JW, Brunning RD, Flandrin G. Essential thrombocythaemia. In: Jaffe ES, Harris NL, Stein H, et al, editors. WHO classification of tumours: tumours of haematopoietic and lymphoid tissues. Lyon: IARC Press; 2001. p. 39-41.<\/li>\n<li class=\"MsoNormal\">Murphy S, Peterson P, Iland H, Laszlo J. Experience of the Polycythemia Vera Study Group with essential thrombocythemia: a final report on diagnostic criteria, survival, and leukemic transition by treatment. Semin Hematol. 1997 Jan;34(1):29-39. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/9025160\/\" target=\"_blank\" rel=\"noopener\">[Medline]<\/a><\/li>\n<li class=\"MsoNormal\">Harrison CN, Green AR. Essential thrombocythemia. Hematol Oncol Clin North Am. 2003 Oct;17(5):1175-90, vii. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/14560781\/\" target=\"_blank\" rel=\"noopener\">[Medline]<\/a><\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p>Created: Sep 03, 2007<\/p>\n\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Sorry, this entry is only available in Espa\u00f1ol.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"no","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[171],"tags":[16,15,14,13,238,239,287,1381,1510,1511],"class_list":["post-2494","post","type-post","status-publish","format-standard","hentry","category-hematology","tag-criteria","tag-criterios","tag-diagnostic","tag-diagnostico","tag-esencial","tag-essential","tag-et","tag-hematology","tag-thrombocytopaenia","tag-trombocitopenia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - 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