How do I choose between different chemiluminescent assay platforms for broad assay availability?

When choosing between chemiluminescent assay platforms for broad assay availability, the main question is usually: which system gives me the widest menu of tests I actually need, with acceptable workflow, throughput, and support? Here’s a practical way to compare them.

1) Start with your test menu requirements

Make a list of:

• Routine assays you run most often
• Specialty assays you may add later
• STAT vs batch needs
• High-volume vs low-volume tests
• Any platform-specific tests your users or clinicians require

A platform with the broadest overall menu is not always the best if it lacks the few critical assays you need.

2) Compare assay breadth in the categories that matter

Look at whether the platform supports:

• Immunoassays: hormones, cardiac markers, infectious disease, tumor markers, etc.
• Endocrine testing: TSH, free T4, cortisol, insulin, PTH
• Infectious disease serology/antigen tests
• Cardiac biomarkers
• Therapeutic drug monitoring
• Autoimmune markers
• Specialty or esoteric assays

Also check:

• Onboard test menu
• Send-out options
• Reagent availability by region
• Regulatory status in your country

3) Evaluate platform compatibility with your workload

Broad availability is only useful if the analyzer fits your workflow:

• Throughput: tests/hour
• Random access vs batch
• Turnaround time
• Walkaway time
• Sample volume requirements
• STAT prioritization
• Maintenance frequency

A very broad menu on a slow or labor-intensive system may not be practical.

4) Consider assay standardization and continuity

If you expect to expand over time, choose a platform with:

• Good reagent consistency
• Strong lot-to-lot stability
• Minimal calibration burden
• Long reagent shelf life
• Reliable supply chain

This matters because “available” assays are not useful if reagents are frequently backordered or unstable.

5) Check clinical and analytical performance

For each important assay, compare:

• Sensitivity / specificity
• Precision
• Limit of detection
• Interference resistance: hemolysis, lipemia, biotin, heterophile antibodies
• Correlation with current methods
• Reference interval consistency

Sometimes the platform with the broadest menu is not the one with the best performance for your key tests.

6) Look at automation and integration

A good broad platform should integrate well with:

• LIS/HIS
• Middleware
• Specimen tracking
• Auto-reflex testing
• Delta checks
• Rules-based routing

If you’re building a high-volume lab, automation and informatics can matter as much as assay count.

7) Assess vendor support and service

Broad availability depends heavily on vendor support:

• Reagent and consumable availability
• Technical service response time
• Application support
• Training
• Software updates
• Local field support

A platform with many assays but weak support can become a bottleneck.

8) Compare total cost of ownership

Don’t just compare reagent prices. Include:

• Analyzer purchase or lease
• Reagents
• Calibrators and controls
• Consumables
• Maintenance contracts
• Service downtime
• Labor and training
• Waste disposal
• Required backup systems

Some platforms appear cheaper per assay but cost more overall due to low throughput or high downtime.

9) Use a scoring matrix

A simple weighted score can help. Example categories:

• Assay breadth: 30%
• Performance: 20%
• Workflow/throughput: 15%
• Support/supply reliability: 15%
• Cost: 10%
• Integration/automation: 10%

Then score each platform against your actual needs.

10) Shortlist by use case

A good rule:

• Small lab / moderate volume: prioritize flexibility, low maintenance, and broad routine menu
• Large hospital lab: prioritize throughput, STAT handling, and automation
• Reference lab: prioritize specialty assay breadth and scalability
• Point-of-care or satellite lab: prioritize simplicity, speed, and menu relevance

Bottom line

Choose the platform that offers the broadest menu for your required assays, with:

1. Reliable performance
2. Workflow fit
3. Strong vendor support
4. Sustainable cost and supply chain

If you want, I can also help you build a side-by-side comparison checklist for specific platforms like Roche, Abbott, Siemens, Beckman, or DiaSorin.