Hemoglobin Distribution Width (HDW) Unit Converter

Hemoglobin Distribution Width (HDW) measures how much variation exists in hemoglobin concentration among your individual red blood cells. Think of it as a uniformity score for how evenly hemoglobin is packed into each cell.

A normal HDW means your red blood cells carry a fairly consistent amount of hemoglobin. A high HDW indicates a mixed population of cells, some with more hemoglobin and some with less, which often signals an underlying problem with red blood cell production or iron supply.

HDW is reported by automated hematology analyzers that use laser light scattering to assess individual red blood cells. It complements other red cell indices like MCV, MCHC, and RDW to give a fuller picture of red blood cell health.

HDW is derived from the hemoglobin concentration of individual red blood cells produced in the bone marrow. It reflects how consistently the marrow is loading hemoglobin into newly formed cells, which depends on adequate iron supply, vitamin levels, and healthy marrow function.