Automated Urine Particle Analyzer

What is the Automated Urine Particle Analyzer?

An automated urine particle analyzer is optimised for counting and differentiating particles in uncentrifuged urine with minimal sample preparation, reporting red cells, white cells, epithelial cells, bacteria and casts. It suits laboratories screening large numbers of urine samples for infection and renal disease.

Overview

The analyzer combines a dilution and staining step with either flow cytometry or impedance and light scatter detection, and its software is tuned for particle discrimination in uncentrifuged urine. Reports focus on the counts most useful for clinical decisions: red cells, white cells, epithelial cells, bacteria, casts, crystals and yeast, with flags for bacterial overgrowth and for results that suggest glomerular bleeding. Sample volume is small, typically 0.5 to 1 millilitre, and the instrument can be used as a standalone or connected to a chemistry analyzer so that results are merged into one urinalysis report. Because it is optimised for screening, atypical results require microscopy confirmation, and periodic comparison studies with manual counting are part of routine quality management.

How does it work?

Urine sediment contains formed elements that indicate renal or urinary tract disease. Automated analyzers detect them in one of two ways. Flow cytometry dilutes urine, stains nucleic acids and cell membranes with a fluorescent dye, and passes the particles through a flow cell where forward scatter indicates size, side scatter indicates granularity and fluorescence indicates nucleic acid content; clustering software classifies the particles and reports counts per volume. Digital imaging introduces a diluted sample into a thin chamber, photographs the particles and applies pattern recognition to classify them, storing images for review. Either method reports counts per microlitre or per high-power field, together with flags when the result requires confirmation. Some instruments include a centrifugation step, and all of them depend on adequate sample mixing, correct dilution and clean optical or fluidic paths.

What are the key features?

• Optimised for uncentrifuged urine with minimal preparation
• Dilution and staining integrated with particle detection
• Counts focused on clinically relevant particle classes
• Flags for bacterial overgrowth and suspected glomerular bleeding
• Small sample volume from 0.5 millilitres
• Standalone use or connection to a chemistry analyzer

What are the technical specifications?

A typical automated urine particle analyzer configuration offers detection principle of Flow cytometry or impedance with light scatter, reported particles of RBC, WBC, epithelial cells, bacteria, casts, crystals, yeast, throughput of 60–100 samples/h, sample volume of 0.5–1.0 mL uncentrifuged urine, reporting units of Cells per microlitre with field equivalents and flags of Bacterial overgrowth, atypical particle pattern. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Automated Urine Particle Analyzer is used in urinary tract infection screening at volume, renal disease screening and follow-up, outpatient urinalysis with combined chemistry reporting and veterinary urine particle analysis. Across the wider Urine Sediment Analyzers class, laboratories also deploy it for urinary tract infection assessment, glomerular and non-glomerular haematuria differentiation and renal disease monitoring and transplant follow-up.

Which standards and certifications apply?

Relevant standards and methods include ISO 15189, CLSI GP16, CLSI EP05, CLSI EP15, IEC 61010-1 and IEC 61010-2-101. Certification candidates for this model are CE, ISO 13485 manufacturing and NMPA class II registration; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Verify performance at installation by comparing results with manual microscopy on a defined number of samples spanning low, normal and high particle counts, and document the agreement, since counts per volume and per high-power field are not directly interchangeable. Run control material or stabilised particle suspensions at the recommended frequency, and clean the flow cell or imaging chamber as instructed, because deposits create artefacts or block the sample path. Maintain the sheath fluid supply where used, and check that it is within its expiry date. Define and document review rules, train staff to interpret the images or counts, and keep records linking stored images to patient results for the retention period required locally.

How do I select the right Automated Urine Particle Analyzer?

Specify this analyzer when screening for infection and renal disease drives the workload and rapid particle counts are needed. In the RFQ confirm the discrimination performance for bacteria and casts, the flagging rules, the sample volume and whether the instrument can be linked to a chemistry analyzer for a combined report.

How does it compare with other Urine Sediment Analyzers variants?

Choose the detection method according to what your clinicians need. Flow cytometry gives fast counts of the main particle classes with minimal labour but limited morphological detail, while digital imaging provides images and better distinction between similar particles such as casts and crystals. Decide whether the analyzer must work with urine that has not been centrifuged, because some instruments require a pre-centrifuged or specially prepared sample. Check the reported particle classes, the counting units, the sample volume and the review rules, and confirm that the instrument can be integrated with the chemistry analyzer so that results appear in one report. Plan for periodic comparison with manual microscopy, and for external quality assessment covering urine sediment.