O valor do RDW (Red Cell Distribution Width) indica se uma quantidade suficiente de suas hemácias possui tamanho e forma normais.
As hemácias normalmente têm uma forma discóide e achatada, com um diâmetro médio de 7,5 µm (micrômetros).
As hemácias têm a função exclusiva de transportar oxigênio para diferentes partes do corpo.
Os vasos sanguíneos são estruturas que transportam o sangue. Existem três tipos principais:
As hemácias precisam passar pelos menores vasos sanguíneos do corpo, os capilares. Como os capilares podem ser tão estreitos quanto 4 µm de diâmetro, as hemácias (com 7,5 µm de diâmetro) devem se deformar e “enrolar” para atravessá-los. Essa deformação é essencial para garantir a distribuição de oxigênio por todo o corpo.
Nem todas as hemácias são formadas de maneira ideal, e isso é normal até certo ponto, já que cerca de 2 milhões de hemácias são produzidas por segundo. Geralmente, entre 85% e 89% das hemácias são desenvolvidas corretamente.
O valor do RDW ajuda a identificar a proporção de hemácias com formato ou tamanho anormais. Normalmente, o RDW varia entre 11% e 15%.
Esses são parâmetros relacionados ao RDW, avaliados em análises de hemácias:
O RDW-CV não avalia o diâmetro exato das hemácias, mas sim a variação no tamanho das células. É calculado pela fórmula:
RDW-CV = (Desvio padrão do MCV ÷ MCV) × 100
O RDW-SD é uma medida direta da largura da curva de distribuição das hemácias, medida em um ponto 20% acima da linha de base (frequência). Por ser uma medida absoluta, o RDW-SD não é influenciado pelo MCV e reflete com maior precisão a variação no tamanho das hemácias. O intervalo normal é entre 39 e 46 fL.
Resultados normais de RDW não descartam a possibilidade de condições subjacentes. Médicos frequentemente comparam o RDW com o MCV para uma análise mais completa.
O RDW, em conjunto com outros parâmetros hematológicos, ajuda a:
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Quando as hemácias têm tamanhos desiguais, essa condição é chamada de anisocitose. O termo deriva de:
A anisocitose é um termo não específico, pois as células podem ser desiguais de várias formas. Essa condição é comum em casos de anemia por deficiência de ferro, em que a falta de ferro reduz a produção de hemácias, que são responsáveis pelo transporte de oxigênio no sangue.
Quando o tamanho e a forma das hemácias não estão adequados, o transporte de oxigênio no corpo é prejudicado, o que pode causar:
RDW alto e MCV normal:
RDW alto e MCV baixo:
RDW alto e MCV alto:
Como várias causas podem levar a um RDW elevado, a redução dessa variação depende do fator subjacente. Um médico pode orientar a melhor abordagem para cada caso.
Adotar uma dieta equilibrada:
Parar de fumar:
Evitar o consumo excessivo de álcool:
Ter sono adequado:
Praticar exercícios regularmente:
Um RDW elevado pode ser causado por diversas condições, sendo importante identificar a causa subjacente para orientar o tratamento adequado. Consultar um profissional de saúde para uma avaliação detalhada é fundamental para compreender os resultados do RDW no contexto do hemograma completo e outros exames clínicos.
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Um RDW baixo significa que há pouca variação no tamanho das hemácias. Isso pode ocorrer devido às seguintes condições:
Em ambos os casos, as hemácias têm tamanhos semelhantes porque são predominantemente pequenas ou grandes.
O RDW é uma medida da variação no tamanho das hemácias e geralmente é relatado como parte de um hemograma completo (HC). Ele pode ser apresentado de duas maneiras:
Fórmula do RDW-CV:
RDW-CV = (Desvio Padrão ÷ MCV) × 100
Um valor baixo de RDW-CV indica que as hemácias possuem tamanhos mais uniformes, com pouca variação.
Na maioria das vezes, um RDW-CV baixo não é motivo de preocupação se os outros parâmetros do hemograma, como MCV, hemoglobina e hematócrito, estiverem normais.
Um RDW-CV baixo é menos comum e menos clinicamente significativo do que um RDW alto, que pode indicar:
Embora um RDW-CV baixo geralmente não seja preocupante, é importante interpretá-lo no contexto de outros parâmetros do hemograma e dos achados clínicos.
Um profissional de saúde pode fornecer uma avaliação abrangente e explicar o que um RDW-CV baixo significa no seu caso específico.
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I have been using Healthmatters.io since 2021. I travel all over the world and use different doctors and health facilities. This site has allowed me to consolidate all my various test results over 14 years in one place. And every doctor that I show this to has been impressed. Because with any health professional I talk to, I can pull up historical results in seconds. It is invaluable. Even going back to the same doctor, they usually do not have the historical results from their facility in a graph format. That has been very helpful.
Karin
Advanced Plan Member since 2020
What fantastic service and great, easy-to-follow layouts! I love your website; it makes it so helpful to see patterns in my health data. It's truly a pleasure to use. I only wish the NHS was as organized and quick as Healthmatters.io. You've set a new standard for health tracking!
Paul
Healthmatters Pro Member since 2024
As a PRO member and medical practitioner, Healthmatters.io has been an invaluable tool for tracking my clients' data. The layout is intuitive, making it easy to monitor trends and spot patterns over time. The ability to customize reports and charts helps me present information clearly to my clients, improving communication and outcomes. It's streamlined my workflow, saving me time and providing insights at a glance. Highly recommended for any practitioner looking for a comprehensive and user-friendly solution to track patient labs!
Healthmatters is a highly-personalized health dashboard.
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While we work with many popular labs, we welcome reports from lots of other places too.
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Yes, you can. When entering values for the biomarker, you will see an "Edit Range" button. Click this button, and you'll have the option to enter a custom range.
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Basófilos (Absoluto), Basófilos (Percentual), Células Brancas do Sangue (Leucócitos / WBC), Células Vermelhas do Sangue (Eritrócitos / RBC), Concentração de Hemoglobina Corpuscular Média (CHCM), Contagem de plaquetas / Plaquetas, Eosinófilos (Absoluto), Eosinófilos (Percentual), Hematócrito (HCT) / Volume de Glóbulos Compactados (VGC), Hemoglobina, Hemoglobina Corpuscular Média (HCM), Linfócitos (Absoluto), Linfócitos (Percentual), Monócitos (Absoluto), Monócitos (Percentual), Neutrófilos (Absoluto), Neutrófilos (Percentual), RDW-CV (Largura de Distribuição das Hemácias) em %, Volume Corpuscular Médio (VCM), Volume Plaquetário Médio (MPV)
