What is marrow cellularity?

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Marrow cellularity is the proportion of marrow space filled with hematopoietic (blood-forming) cells compared to fat. It’s described as the ratio of marrow cells to fat (often expressed as a percentage of cellular tissue). This reflects how much of the marrow’s space is dedicated to producing blood cells. In adults, normal cellularity is roughly around half cellular and half fat, though it varies with age and individual factors. A higher cellularity means more hematopoietic cells, while a lower cellularity means more fat content. Hence, the statement describing the ratio of marrow cells to fat best captures what marrow cellularity represents.