Siemens ADVIA 2120, Operator'S Manual, Page: 312 / 477

Methods 8-43
In samples with increased numbers of hyperchromic RBCs, the histogram curve
shifts to the right, indicating an increase in the percentage of the cells with
hemoglobin concentrations greater than 41 g/dL.
RBC HC histogram (Hgb variance sample)
1 Hypochromic region
2 Normochromic region
3 Hyperchromic region
4 28 g/dL marker
5 41 g/dL marker
HDW provides an indication of Hgb concentration variance, and the results are
flagged if the HDW exceeds 3.4 g/dL. Note that two specimens with the same
HDW value can have different degrees of hypochromia and hyperchromia.
RBC CH Histogram
The RBC CH (cellular
hemoglobin) histogram
represents the distribution
of red blood cells by the
amount of hemoglobin
present in each cell
independent of cell volume.
The histogram has a range of 0 picograms to 100 picograms.
Cellular Hemoglobin Content (CH) is the mean of the RBC CH histogram. The
cell hemoglobin distribution width (CHDW) is the standard deviation of the RBC
CH histogram.
RBC Scatter Cytogram
The RBC Scatter cytogram is the graphical representation of two light-scatter
measurements: the high-angle light scatter (5° to 15°) is plotted along the x axis,
and the low-angle light scatter (2° to 3°) is plotted along the y axis.