Large Unstained Cells (Absolute)

This is the actual number of large unstained cells per unit of blood, an analyzer category for larger, atypical-looking white cells that don't stain in the usual way. It can include activated lymphocytes and other unusual cells.

blood10^3/µLAlso known as LUC#, Large Peroxidase Negative Cells Absolute

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Why it matters

The absolute count gives a steadier measure than the percentage of how many of these atypical cells are present. Because it is a non-specific automated grouping, its main value is flagging cells that may warrant a microscope review. It is a screening cue rather than a specific finding.

If it runs high

An elevated absolute LUC count can accompany immune activation, some viral infections, or the presence of atypical cells. Since it is a broad analyzer category, a raised value typically prompts a manual smear review rather than a diagnosis. Your clinician interprets it alongside your complete blood count.

If it runs low

A low or zero absolute count is common and generally not a concern.

What to aim for

This is an analyzer-specific value not reported by every lab, so use your report's range and let your clinician decide whether further review is needed.

Sources

  1. MedlinePlus: Blood Differential Test
  2. Cleveland Clinic: White Blood Cells

Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.