Bringing CBC testing in-house can shorten the path from sample collection to laboratory review during routine consultations, follow-up visits, and urgent cases. However, an in-house veterinary CBC workflow needs more than a completed installation. It needs defined species coverage, controlled sample handling, trained operators, documented quality checks, and clear follow-up rules for unexpected results.

For companion-animal clinics, validation is most useful when it reflects the cases seen every day. That means confirming how the analyzer will be used for canine and feline blood samples, which results can be reported routinely, and when the workflow should move to repeat testing, blood-smear review, or referral testing. Ozelle develops veterinary diagnostic analyzers for this type of in-house workflow, combining hematology with selected urine, feces, and immunoassay testing capabilities across the EHVT series.

Validation Begins With the Clinic’s Actual Caseload

Veterinary CBC validation should start with a simple but important question: which animals and samples will this clinic test routinely?

For most companion-animal practices, the answer is canine and feline EDTA-anticoagulated whole blood. That scope should be written into the clinic’s intended-use statement before routine reporting begins. A clear scope prevents a common workflow problem: treating all animal blood samples as interchangeable, even when species-specific reference intervals, cell characteristics, sample quality risks, and review criteria may differ.

Species-specific planning matters because a CBC result is not interpreted only by whether it falls above or below a displayed range. White blood cell distributions, red-cell findings, platelet-related results, and the clinical relevance of an abnormal flag can differ between dogs and cats. A clinic should therefore verify canine and feline workflows separately rather than assuming that performance in one species automatically applies to the other.

What a Veterinary CBC Validation Workflow Should Confirm

A local CBC validation or verification process is not intended to reproduce a manufacturer’s product-development work. Its purpose is to confirm that the analyzer, operators, sample-handling procedures, quality controls, and result-review process are suitable for the clinic’s defined use.

The process should answer five practical questions:

Validation focus	What the clinic should confirm
Intended use	Which species, sample types, operators, and CBC parameters are included in routine reporting?
Operational readiness	Are the analyzer configuration, reagents, QC materials, calibration procedures, staff training, and maintenance tasks in place?
Analytical consistency	Do QC and repeat-testing results remain within the clinic’s documented acceptance process?
Comparison process	How will the clinic assess meaningful differences between in-house results and a reference pathway?
Review and escalation	When should staff repeat a test, prepare a blood smear, check a previous result, or refer a sample externally?

This structure keeps the discussion focused on the real issue behind the search term: validation is not a single pass-or-fail event. It is the process of establishing a controlled CBC workflow before routine clinical use.

The workflow should also distinguish between testing modules. A clinic using one analyzer for hematology, urine, feces, or immunoassays may benefit from a more consolidated bench workflow, but each test type still has different specimen requirements, QC materials, acceptance criteria, and follow-up procedures.

Species-Specific Verification for Canine and Feline CBC Testing

Verification should begin with the analyzer’s intended species configuration. Before routine use, the clinic should confirm the supported animal species, sample requirements, reportable parameters, and reference-interval approach that applies to its day-to-day cases.

For canine and feline clinics, the verification plan should cover:

• Available canine and feline testing modes
• EDTA whole-blood collection and mixing procedures
• Sample labeling, storage, and time-to-analysis rules
• CBC, differential, platelet-related, and available morphology-related parameters
• Species-specific reference-interval documentation
• Daily QC responsibilities and corrective-action procedures
• Criteria for reviewing analyzer flags or unexpected results
• Circumstances that require repeat testing, blood-smear review, or referral testing

This is where instrument selection and workflow design become closely connected. A clinic that routinely manages CBC, urinalysis, and fecal testing needs to define not only how each test is performed, but also how the team moves from one result to the next during a consultation.

Die EHVT-75 veterinary hematology analyzer is designed for canine and feline use and combines 9-diff hematology with automated urine and feces analysis. Its hematology workflow uses 100 μL of sample, while urine and feces testing each use 200 μL. The analyzer reports 48 Complete Blood Morphology (CBM) parameters, including CBC, differential, red-cell, reticulocyte, nucleated red-cell, and platelet-related parameters. With a dry QC card, automatic calibration, LIS/USB/LAN connectivity, and storage for up to 10,000 results, the system provides operational functions that can be incorporated into a clinic’s documented QC and result-review process.

Step 1: Confirm the Analyzer Is Ready for Routine Use

The first validation stage is operational readiness. Before comparison samples or clinical cases are used for routine reporting, the clinic should confirm that the analyzer and its supporting processes are ready.

This includes:

• Analyzer model, serial number, software version, and active configuration
• Supported canine and feline settings
• Reagent, diluent, staining, cartridge, and consumable lot information
• QC material availability, storage conditions, and run schedule
• Calibration status and required calibration checks
• Sample collection, labeling, mixing, and rejection criteria
• Staff training records and assigned operating responsibilities
• Daily, periodic, and corrective maintenance procedures
• Data export, connection, and animal-record processes
• Technical-support and escalation contacts

This preparation step is important because many apparent analytical discrepancies begin before measurement. Inadequate sample mixing, delayed analysis, a partial clot, incorrect storage, expired QC materials, or an unclear operator handover can affect the reliability of the workflow even when the analyzer itself is functioning normally.

For a compact clinic environment, it is also useful to map the complete sample journey: collection, labeling, preparation, test selection, result review, documentation, and any next action. This prevents hematology, urine, feces, and immunoassay workflows from becoming disconnected tasks managed by different informal routines.

Step 2: Evaluate Precision and Routine QC Performance

Precision assessment evaluates whether the analyzer produces sufficiently consistent results when the same material is tested repeatedly. In daily practice, this is closely connected to the clinic’s quality-control process.

The clinic should identify the parameters most relevant to its routine CBC workflow. Depending on the analyzer’s reportable outputs, this may include:

• WBC and white blood cell differential parameters
• RBC, HGB, HCT, MCV, MCH, and MCHC
• Platelet-related parameters
• Reticulocyte or other morphology-related parameters
• Instrument flags and results that trigger an additional review step

QC should be performed according to the analyzer instructions and the clinic’s written quality plan. The plan should specify not only when QC is run, but also what the clinic will do if QC does not meet its predefined acceptance criteria.

A practical corrective-action sequence may include:

1. Pause routine result release for the affected workflow.
2. Check QC storage, expiry date, lot information, preparation, and mixing.
3. Review analyzer status, consumables, maintenance records, and calibration requirements.
4. Repeat QC according to the clinic’s SOP.
5. Complete required corrective actions or contact technical support if the issue remains unresolved.
6. Record the investigation, corrective action, follow-up result, and authorization to resume testing.

This approach makes QC part of routine laboratory control rather than a checklist item performed without a defined response to failure.

Step 3: Compare In-House CBC Results With a Reference Pathway

A comparison study helps a clinic understand how its in-house CBC results relate to an established reference pathway. Depending on the clinic’s resources, this may involve a reference laboratory, an existing analyzer during a transition period, blood-smear review, selected manual methods, or veterinary clinical pathology support.

Comparison samples should reflect the clinic’s actual caseload. Whenever feasible, the study should include samples across typical, low, high, and unexpected result ranges. Canine and feline samples should be considered separately because a dataset from one species should not be assumed to establish performance for the other.

For each sample, the clinic should document:

• Animal species and relevant case information
• Sample collection time and analyzer run time
• Anticoagulant and visible sample-quality observations
• In-house result and comparison result
• Relevant flags or morphology-related findings
• Repeat-test or blood-smear review actions
• A documented explanation for any meaningful difference

The objective is not to expect complete numerical agreement between two analytical pathways. Differences may arise from sample timing, sample condition, method principle, or biological variation. The more useful question is whether the clinic can recognize, investigate, and appropriately manage a difference that could affect laboratory review.

If a result conflicts with the animal’s presentation, previous laboratory results, or sample appearance, the team should follow the clinic’s escalation process rather than relying on the automated result alone.

Step 4: Establish a Clear Flag and Smear-Review Process

Analyzer flags, graphical outputs, and morphology-related findings can provide useful context for laboratory review. They should be interpreted as prompts for a defined review process, not as automatic confirmation of a specific disease or as a replacement for veterinary interpretation.

The clinic should establish written criteria for findings that require an additional step. Common triggers include:

• Unexpectedly high or low WBC, RBC, HGB, HCT, or platelet-related results
• Recurrent or unusual analyzer flags
• Marked changes from previous animal records
• Suspected platelet aggregation
• Clotting, poor sample mixing, hemolysis, or other sample-quality concerns
• Results that do not match the clinical presentation or other laboratory information
• Samples from species outside the analyzer’s supported configuration

A clear review pathway can be written as:

CBC result generated → sample quality and QC status checked → repeat analysis when appropriate → flags and available morphology-related findings reviewed → blood smear prepared when indicated → results reviewed with case information → referral testing or specialist review arranged when needed.

This sequence keeps the analyzer within its appropriate role: generating hematology information that supports laboratory review and veterinary case assessment.

For clinics that need broader in-house testing alongside CBC, the EHVT-50 – Multifunktionaler Analysator für die Veterinärmedizin combines canine and feline 9-diff hematology with immunoassays, urine testing, and feces testing. The hematology module reports 48 CBM parameters, including WBC and differential parameters, RBC indices, reticulocyte values, SPH, ETG, NRBC-related results, and platelet-related parameters. The analyzer’s stated sample-volume range is 100–200 μL, and its throughput is 5–7 samples per hour. It also provides dry-card QC, automatic calibration, LIS/USB/LAN connectivity, a 10.1-inch full-color touchscreen, and storage for up to 10,000 results. These features can support a more organized diagnostic workflow, while each module should remain subject to its own sample-handling, QC, and result-review SOP.

Step 5: Document Species-Specific Reference Intervals

Reference intervals are an essential part of veterinary CBC interpretation. They help determine whether a result is expected, requires additional review, or should be considered alongside the animal’s individual characteristics and clinical findings.

The clinic should document:

• Canine and feline reference intervals used for each reported parameter
• The interval source, version, and intended analyzer configuration
• Who is responsible for approving and updating the interval record
• How the clinic manages age, breed, physiological state, and other interpretation factors
• The process for samples outside the routine species scope

A displayed reference interval should not be treated as a universal range for every animal. It should be reviewed in relation to the analyzer’s intended species configuration and the clinic’s defined workflow. This is particularly important when clinics receive samples from non-routine species, where manual review, referral laboratory testing, or veterinary clinical pathology consultation may be more appropriate.

Step 6: Maintain Validation Through Ongoing Quality Management

Initial verification establishes the workflow; ongoing quality management maintains it. A clinic should reassess the process when a change could affect performance, result consistency, or routine operation.

Examples include:

• A new reagent, QC material, or key consumable lot
• Major maintenance, repair, or relocation
• Calibration activity or software updates
• Extended analyzer downtime
• Persistent QC shifts or repeated result discrepancies
• A change in the clinic’s species mix, sample volume, or test menu
• Expanded use of urine, feces, or immunoassay modules

For clinics considering whether a focused hematology analyzer or a broader multi-functional workflow better fits their caseload, veterinary blood analyzer vs multi-functional analyzer outlines how sample types, staffing, test volume, quality-management capacity, and referral-laboratory needs can shape the decision. The same factors should be reviewed when planning validation: the more test modules a clinic introduces, the more important it becomes to maintain separate, clearly documented quality procedures for each module.

Schlussfolgerung

Veterinary CBC analyzer validation should be built around the clinic’s actual testing scope, not around a generic definition of veterinary use. For canine and feline in-house testing, that means defining sample requirements, operator responsibilities, QC procedures, reference intervals, result-review criteria, and escalation pathways before routine reporting begins.

A compact analyzer can bring hematology and selected complementary tests closer to the consultation workflow. Its value depends on how well the clinic connects the equipment to disciplined sample handling, quality control, documented review criteria, and veterinary interpretation.

When validation is approached as an ongoing workflow rather than a one-time installation task, clinics can organize in-house CBC testing with clearer operational boundaries for routine results, blood-smear review, referral testing, and continued quality management.