{"id":24321,"date":"2026-02-28T22:53:50","date_gmt":"2026-03-01T02:53:50","guid":{"rendered":"https:\/\/cliniqueomicron.ca\/anisochromie\/"},"modified":"2026-09-17T22:19:59","modified_gmt":"2026-09-18T02:19:59","slug":"anisochromia","status":"publish","type":"page","link":"https:\/\/cliniqueomicron.ca\/en\/anisochromie\/","title":{"rendered":"Anisochromia: Causes, Diagnosis, and Significance | Clinique Omicron"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"24321\" class=\"elementor elementor-24321\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3c4e6ce e-flex e-con-boxed e-con e-parent\" data-id=\"3c4e6ce\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;ekit_has_onepagescroll_dot&quot;:&quot;yes&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-85b585c elementor-widget elementor-widget-html\" data-id=\"85b585c\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;ekit_we_effect_on&quot;:&quot;none&quot;}\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Cinzel:wght@600&family=Poppins:wght@400;500;600;700&display=swap');\n\n.co-wrap * {\n  font-family: 'Poppins', sans-serif;\n  box-sizing: border-box;\n}\n.co-wrap {\n  max-width: 1100px;\n  margin: 0 auto;\n  padding: 30px 0 60px;\n  margin-top: 10px;\n}\n.co-label {\n  font-family: 'Cinzel', serif;\n  font-size: 14px;\n  font-weight: bold;\n  letter-spacing: 1px;\n  text-transform: uppercase;\n  color: #4D6577;\n  margin-bottom: 14px;\n  display: block;\n}\n.co-wrap h1 {\n  font-size: 32px;\n  font-weight: 500;\n  color: #323C52;\n  margin: 0 0 22px;\n  line-height: 1.2;\n  letter-spacing: 0.5px;\n}\n.co-intro {\n  font-size: 16px;\n  font-weight: 400;\n  line-height: 1.75;\n  color: #4D6577;\n  margin-bottom: 36px;\n  padding-bottom: 32px;\n  border-bottom: 1px solid rgba(77,101,119,.2);\n}\n.co-wrap h2 {\n  font-size: 20px;\n  font-weight: 600;\n  color: #323C52;\n  margin: 32px 0 12px;\n  letter-spacing: 0.3px;\n}\n.co-wrap p {\n  font-size: 15px;\n  font-weight: 400;\n  color: #4D6577;\n  line-height: 1.7;\n  margin-bottom: 14px;\n}\n.co-list {\n  list-style: none;\n  padding: 0;\n  margin: 12px 0 24px;\n}\n.co-list li {\n  font-size: 15px;\n  font-weight: 400;\n  color: #4D6577;\n  padding: 10px 14px 10px 38px;\n  margin-bottom: 8px;\n  border-radius: 6px;\n  position: relative;\n  background: rgba(77,101,119,.06);\n  border-left: 3px solid #4D6577;\n}\n.co-list li::before {\n  content: \"\u2713\";\n  position: absolute;\n  left: 12px;\n  font-weight: 700;\n  color: #4D6577;\n}\n.co-table {\n  width: 100%;\n  border-collapse: collapse;\n  margin: 14px 0 22px;\n  font-size: 14px;\n  border-radius: 8px;\n  overflow: hidden;\n}\n.co-table thead tr {\n  background: #323C52;\n  color: #fff;\n}\n.co-table thead th {\n  padding: 11px 16px;\n  text-align: left;\n  font-weight: 600;\n  font-size: 13px;\n}\n.co-table tbody tr:nth-child(even) { background: rgba(77,101,119,.06); }\n.co-table tbody tr:nth-child(odd) { background: #fff; }\n.co-table td {\n  padding: 10px 16px;\n  color: #4D6577;\n  border-bottom: 1px solid rgba(77,101,119,.12);\n  font-size: 14px;\n  vertical-align: top;\n}\n.co-table td:first-child {\n  font-weight: 600;\n  color: #323C52;\n}\n.co-infobox {\n  display: flex;\n  gap: 12px;\n  background: rgba(77,101,119,.06);\n  border-radius: 8px;\n  border-left: 4px solid #4D6577;\n  padding: 14px 18px;\n  margin: 18px 0 28px;\n  font-size: 14px;\n  font-weight: 400;\n  color: #4D6577;\n  line-height: 1.65;\n}\n.co-infobox .ico { font-size: 18px; flex-shrink: 0; }\n<\/style>\n\n<div class=\"co-wrap\">\n  <span class=\"co-label\">Hematology - Erythrocyte Morphology<\/span>\n  <h1>Anisochromia<\/h1>\n<style>.oc-fiche-cta{margin:8px 0 34px;padding:22px 24px;border:1.5px solid rgba(50,60,82,.15);border-left:4px solid #FF611C;border-radius:12px;background:#F4F6F8;font-family:Poppins,sans-serif}.oc-fiche-cta-t{font-size:18px;font-weight:600;color:#323C52;margin:0 0 4px;line-height:1.35}.oc-fiche-cta-x{font-size:15px;color:#4D6577;margin:0 0 14px;line-height:1.55}.oc-fiche-cta-b{display:flex;flex-wrap:wrap;gap:10px}.oc-fiche-cta-b a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border-radius:8px;font-size:14px;font-weight:600;text-decoration:none;box-sizing:border-box}.oc-fiche-cta-b .oc-p{background:#FF611C;color:#fff}.oc-fiche-cta-b .oc-p:hover{background:#E04E0C}.oc-fiche-cta-b .oc-s{background:#fff;color:#323C52;border:1.5px solid rgba(50,60,82,.25)}@media (max-width:600px){.co-wrap h1{font-size:24px;line-height:1.25;text-transform:none}.oc-fiche-cta{padding:18px 16px}.oc-fiche-cta-b a{flex:1 1 100%}body .co-wrap > .co-table,body .co-wrap > .co-table tbody,body .co-wrap > .co-table tr,body .co-wrap > .co-table td{display:block;width:100%;box-sizing:border-box}body .co-wrap > .co-table{min-width:0;table-layout:auto}body .co-wrap > .co-table thead{display:none}body .co-wrap > .co-table tr{margin:0 0 10px;border:1px solid rgba(77,101,119,.18);border-radius:8px;overflow:hidden}body .co-wrap > .co-table td{padding:9px 12px;border:0}body .co-wrap > .co-table td:first-child{font-weight:600;color:#323C52;background:rgba(77,101,119,.07)}#ocw{transform:scale(.8);transform-origin:bottom right}}<\/style><div class=\"oc-fiche-cta\" data-oc-cta=\"fiche-haut-lab\"><p class=\"oc-fiche-cta-t\">Faire cette analyse<\/p><p class=\"oc-fiche-cta-x\">Pr\u00e9l\u00e8vements sanguins dans nos points de service au Qu\u00e9bec. Un professionnel peut aussi interpr\u00e9ter vos r\u00e9sultats avec vous.<\/p><div class=\"oc-fiche-cta-b\"><a class=\"oc-p\" href=\"https:\/\/cliniqueomicron.ca\/prelevements-medicaux\/\">Blood sampling<\/a><a class=\"oc-s\" href=\"https:\/\/cliniqueomicron.ca\/rendez-vous\/\">Make an appointment<\/a><a class=\"oc-s\" href=\"tel:+15146063350\">514 606-3350<\/a><\/div><\/div>\n\n\n  <div class=\"co-intro\">\n    Anisochromia is a morphological abnormality of red blood cells revealed by microscopic examination of a blood smear. It is characterized by an abnormal variation in color intensity between erythrocytes in the same sample, with some appearing hypochromic (pale, with an enlarged central zone) and others normochromic or hyperchromic. This heterogeneity reflects irregular erythrocyte production, often secondary to iron deficiency being corrected, mixed anemia or variable bone marrow response. Anisochromia is frequently associated with other erythrocyte abnormalities, notably anisocytosis (size variation) and poikilocytosis (shape variation). It is reported in the complete blood count (CBC) as a qualitative statement, or quantified by the red cell distribution index (RDW). Its discovery is never a diagnosis in itself, but a sign that requires a structured etiological investigation to identify the underlying cause and institute the appropriate treatment.\n  <\/div>\n\n  <h2>Understanding Red Blood Cell Coloration<\/h2>\n  <p>A normal red blood cell contains an adequate amount of hemoglobin, which gives it a uniform pink color with a slightly paler central area, representing about one-third of the cell's diameter. When the hemoglobin content decreases, the pale area gradually widens; this is called hypochromia. Conversely, a red blood cell denser in hemoglobin appears darker and lacks a clear central area, which is termed hyperchromia, observed notably in spherocytosis.<\/p>\n  <p>Anisochromia refers to the coexistence of erythrocytes with different colorations within the same smear. This heterogeneity reflects the simultaneous production of red blood cells under variable metabolic conditions, which occurs notably during the transition between two distinct hematological states.<\/p>\n\n  <div class=\"co-infobox\">\n    <span class=\"ico\">\u2139\ufe0f<\/span>\n    <span>The red blood cell distribution width (RDW) objectively measures the variation in red blood cell size but does not directly distinguish variations in color. Anisochromia is visually assessed on a blood smear by a hematologist or medical technologist. An elevated RDW often accompanies anisochromia, but the two parameters are not interchangeable.<\/span>\n  <\/div>\n\n  <h2>Main causes<\/h2>\n  <p>Anisochromia occurs in any context where the bone marrow simultaneously produces erythrocytes with different hemoglobin compositions. The most frequent causes are as follows.<\/p>\n  <table class=\"co-table\">\n    <thead>\n      <tr>\n        <th>Cause<\/th>\n        <th>Mechanism<\/th>\n        <th>Typical clinical setting<\/th>\n      <\/tr>\n    <\/thead>\n    <tbody>\n      <tr>\n        <td>Iron deficiency treatment.<\/td>\n        <td>Coexistence of old hypochromic erythrocytes and new normochromic red blood cells produced after correction<\/td>\n        <td>Patient on iron supplementation for 2 to 6 weeks<\/td>\n      <\/tr>\n      <tr>\n        <td>Early iron deficiency<\/td>\n        <td>Beginning of iron ore reserve depletion; production still mixed<\/td>\n        <td>Woman of childbearing age, frequent blood donor, vegan<\/td>\n      <\/tr>\n      <tr>\n        <td>Sideroblastic anemia<\/td>\n        <td>Defect in iron incorporation into heme despite adequate stores<\/td>\n        <td>Chronic alcoholism, lead poisoning, X-linked hereditary form<\/td>\n      <\/tr>\n      <tr>\n        <td>Mixed anemia (iron deficiency + vitamin B12 or folate deficiency)<\/td>\n        <td>Simultaneous production of hypochromic microcytes and normochromic macrocytes<\/td>\n        <td>Malnutrition, malabsorption, pregnancy, bariatric surgery<\/td>\n      <\/tr>\n      <tr>\n        <td>Recent blood transfusion<\/td>\n        <td>Mixing of donor and recipient erythrocytes with different characteristics<\/td>\n        <td>Immediate post-transfusion in a context of chronic anemia<\/td>\n      <\/tr>\n      <tr>\n        <td>Myelodysplasia<\/td>\n        <td>Ineffective erythropoiesis with heterogeneous cell production<\/td>\n        <td>Adult over 60 years old, unexplained cytopenias<\/td>\n      <\/tr>\n      <tr>\n        <td>Thalassemia minor<\/td>\n        <td>Reduced synthesis of globin chains; variable microcytosis and hypochromia<\/td>\n        <td>Mediterranean, Middle Eastern, Asian, or African origins<\/td>\n      <\/tr>\n    <\/tbody>\n  <\/table>\n\n  <h2>Associated anomalies on peripheral blood smear<\/h2>\n  <p>Anisochromia is rarely isolated. It most often occurs within a broader morphological picture that points to the underlying etiology. The overall interpretation of the smear includes the analysis of the following elements.<\/p>\n  <ul class=\"co-list\">\n    <li>Anisocytosis: Variation in the size of erythrocytes (microcytes, macrocytes)<\/li>\n    <li>Poikilocytosis: variation in shape (target cells, elliptocytes, schistocytes)<\/li>\n    <li>Presence of ring sideroblasts on Perls stain (sideroblastic anemia)<\/li>\n    <li>Neutrophil hypersegmentation (vitamin B12 or folate deficiency)<\/li>\n    <li>Reticulocytosis: indicates an active bone marrow response to anemia<\/li>\n    <li>Reactive thrombocytosis frequently associated with iron deficiency<\/li>\n  <\/ul>\n\n  <h2>Additional biological parameters<\/h2>\n  <p>The blood smear provides qualitative information that automated complete blood counts cannot fully replace. In the presence of anisochromia, an etiologic workup is indicated to identify the underlying deficiency(ies) and measure their severity.<\/p>\n  <table class=\"co-table\">\n    <thead>\n      <tr>\n        <th>Parameter<\/th>\n        <th>Guiding value<\/th>\n        <th>Meaning<\/th>\n      <\/tr>\n    <\/thead>\n    <tbody>\n      <tr>\n        <td>Serum ferritin<\/td>\n        <td>Low (&lt; 15\u201330 \u00b5g\/L)<\/td>\n        <td>Depletion of iron stores; the most sensitive marker of iron deficiency<\/td>\n      <\/tr>\n      <tr>\n        <td>Serum iron and transferrin saturation<\/td>\n        <td>Base (&lt; 20 %)<\/td>\n        <td>Reduced iron availability for erythropoiesis<\/td>\n      <\/tr>\n      <tr>\n        <td>RDW (IDE)<\/td>\n        <td>High (&gt; 14.5 %)<\/td>\n        <td>Red blood cell size heterogeneity; often correlates with anisochromia<\/td>\n      <\/tr>\n      <tr>\n        <td>MCV (mean corpuscular volume)<\/td>\n        <td>Low, normal, or high<\/td>\n        <td>Orient towards microcytosis, normocytosis, or macrocytosis depending on the cause<\/td>\n      <\/tr>\n      <tr>\n        <td>MCHC (Mean Corpuscular Hemoglobin Concentration)<\/td>\n        <td>Low (&lt; 27 pg)<\/td>\n        <td>Confirm erythrocyte hypochromia<\/td>\n      <\/tr>\n      <tr>\n        <td>Vitamin B12 and folate<\/td>\n        <td>Bass<\/td>\n        <td>Associated deficiency in mixed anemia<\/td>\n      <\/tr>\n      <tr>\n        <td>Hemoglobin electrophoresis<\/td>\n        <td>Fraction Anomaly<\/td>\n        <td>Suspicion of thalassemia or hemoglobinopathy<\/td>\n      <\/tr>\n      <tr>\n        <td>Reticulocytes<\/td>\n        <td>High or low depending on the context<\/td>\n        <td>Assess the medullary response and differentiate between a regenerative or aregenerative anemia<\/td>\n      <\/tr>\n    <\/tbody>\n  <\/table>\n\n  <div class=\"co-infobox\">\n    <span class=\"ico\">\u2139\ufe0f<\/span>\n    <span>Ferritin is an acute phase reactant: it can be falsely normal or elevated in the presence of inflammation, infection, or liver disease, even in cases of true iron deficiency. In an inflammatory context, a ferritin level below 100 \u00b5g\/L combined with a low transferrin saturation may be sufficient to diagnose functional iron deficiency.<\/span>\n  <\/div>\n\n  <h2>Support according to etiology<\/h2>\n  <p>The treatment for anisocytosis is to treat its cause. There is no specific treatment for the color variation itself; it disappears as the underlying abnormality is corrected. A hematologic reevaluation with CBC and smear is recommended 4 to 8 weeks after treatment to confirm the response.<\/p>\n  <ul class=\"co-list\">\n    <li>Iron deficiency: oral supplementation with ferrous sulfate or gluconate; correction of the cause (bleeding, malabsorption)<\/li>\n    <li>Vitamin B12 deficiency: intramuscular cyanocobalamin injections or high-dose oral supplementation depending on the cause<\/li>\n    <li>Folate Deficiency: Oral Folic Acid; Correction of Nutritional or Drug Factors<\/li>\n    <li>Acquired sideroblastic anemia: removal of the causal factor (alcohol, medication, toxin); pyridoxine in responsive forms<\/li>\n    <li>Minor thalassemia: genetic counseling, monitoring; no iron treatment unless proven deficiency<\/li>\n    <li>Myelodysplasia: Hematology reference for staging and specialized treatment<\/li>\n  <\/ul>\n\n  <h2>Tracking and monitoring<\/h2>\n  <p>An anisochromia incidentally discovered on a routine CBC should not be ignored, even in the absence of symptoms. Correcting an identified nutritional deficiency is generally simple and effective, but biological monitoring is essential to confirm the response to treatment and rule out a more serious underlying cause. In the absence of normalization upon re-evaluation, further investigation, including specialist hematology consultation, is warranted.<\/p>\n\n  <h2>Consult at Clinique Omicron<\/h2>\n  <p>Clinique Omicron dispose, dans ses points de service au Qu\u00e9bec, d'une \u00e9quipe m\u00e9dicale en mesure d'\u00e9valuer et d'interpr\u00e9ter une anisochromie mise en \u00e9vidence sur une formule sanguine compl\u00e8te. Nos m\u00e9decins proc\u00e8dent \u00e0 l'histoire clinique d\u00e9taill\u00e9e, prescrivent le bilan \u00e9tiologique appropri\u00e9 et assurent le suivi de la r\u00e9ponse au traitement. Qu'il s'agisse d'une carence nutritionnelle \u00e0 corriger ou d'une anomalie h\u00e9matologique n\u00e9cessitant une orientation vers un sp\u00e9cialiste, nos \u00e9quipes sont disponibles en consultation \u00e0 l'un de nos points de service au Qu\u00e9bec, ainsi qu'en t\u00e9l\u00e9consultation pour une premi\u00e8re \u00e9valuation.<\/p>\n\n  <style>.co-disclaimer{font-size:13px;color:#8a9aaa;font-style:italic;border-top:1px solid rgba(77,101,119,.15);padding-top:24px;margin-top:40px;line-height:1.6;}<\/style>\n  <p class=\"co-disclaimer\">The content of this page is provided for informational purposes only and is not intended to replace the advice of a qualified healthcare professional. Consult a physician for any symptoms, questions or decisions you may have regarding your health.<\/p>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>H\u00e9matologie \u2014 Morphologie \u00e9rythrocytaire Anisochromie L&#8217;anisochromie est une anomalie morphologique des globules rouges mise en \u00e9vidence lors de l&#8217;examen microscopique d&#8217;un frottis sanguin. Elle se caract\u00e9rise par une variation anormale de l&#8217;intensit\u00e9 de coloration entre les \u00e9rythrocytes d&#8217;un m\u00eame \u00e9chantillon, certains apparaissant hypochromes (p\u00e2les, avec une zone centrale \u00e9largie) et d&#8217;autres normochromes ou hyperchromes. Cette&hellip;&nbsp;<a href=\"https:\/\/cliniqueomicron.ca\/en\/anisochromie\/\" rel=\"bookmark\">Read More \"<span class=\"screen-reader-text\">Anisochromia: Causes, Diagnosis, and Significance | Clinique Omicron<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","_themeisle_gutenberg_block_has_review":false,"_metasync_otto_title":"","_metasync_otto_description":"","_metasync_otto_keywords":"anisochromie, causes d'anisochromie, diagnostic anisochromie, gestion anisochromie, consultations m\u00e9dicales, m\u00e9decine esth\u00e9tique, sant\u00e9 des patients, Clinique Omicron","_metasync_otto_og_title":"","_metasync_otto_og_description":"","_metasync_otto_twitter_title":"","_metasync_otto_twitter_description":"","rank_math_title":"","rank_math_description":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_aioseo_title":"Anisochromie : causes, diagnostic et signification | Clinique Omicron","_aioseo_description":"L'anisochromie d\u00e9signe une variation de coloration des globules rouges \u00e0 l'analyse sanguine. Causes, interpr\u00e9tation et prise en charge au Qu\u00e9bec.","_metasync_seo_title":"Anisochromie : causes, diagnostic et signification | Clinique Omicron","_metasync_seo_desc":"","_metasync_breadcrumb_title":"","_metasync_primary_category":0,"_metasync_primary_product_cat":0,"_metasync_imported_seo_title":"","_metasync_imported_seo_desc":"","_metasync_otto_disabled":"","_metasync_hreflang":"","_metasync_plugin_sync_ts":"{\"aioseo\":\"2026-09-18T02:20:00+00:00\"}","_metasync_robots_advanced":"","_metasync_og_title":"Anisochromie : causes, diagnostic | Clinique Omicron","_metasync_og_description":"L'anisochromie d\u00e9signe une variation de coloration des globules rouges \u00e0 l'analyse sanguine. Causes, interpr\u00e9tation et prise en charge au Qu\u00e9bec.","_metasync_twitter_title":"Anisochromie : causes, diagnostic | Clinique Omicron","_metasync_twitter_description":"L'anisochromie d\u00e9signe une variation de coloration des globules rouges \u00e0 l'analyse sanguine. 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