Decision: what does this scan support?

You are handed the guided case worksheet: a full, even low-power scan, hyaline casts 0 to 1 per low-power field, no crystals seen, and on high power an erythrocyte count of 12 to 18 per field against a 0 to 2 field interval, with leukocytes and epithelial cells unremarkable. The dipstick shows blood 2+ and leukocyte esterase negative; blood-pad heme activity and sediment erythrocytes are distinct observations that agree in this case.

Your task is to decide what this evidence supports and what it does not, and to choose the defensible next step. The scan was systematic and even, so a preparation problem is not the explanation for the erythrocyte finding. The count is above the worksheet's stated interval and is reproducible across the fields you examined.

A laboratory professional's job here is not to name a cause. It is to report the observed, reproducible finding in the laboratory's own terms, note that it falls outside the stated interval, and route it according to the laboratory's own escalation policy for a result outside interval, rather than deciding on your own whether to hold, repeat, or call it.

If instead the scan had been patchy, if fields varied widely in what they showed, or if an element could not be confidently identified, the same numeric count would not be reportable as stated; the first move would be to document the limitation and repeat or refer the preparation per local policy, not to report an average of an unreliable scan.

A defensible sediment report separates a reproducible, well-scanned finding from a preparation problem, and either one has its own next step, not the same one.