MSD U-PLEX · Custom Configuration

2–10 Analytes · Linker-Coupled Antibodies

MSD U-PLEX Custom Cytokine & Chemokine Panel Services

Q: What is the minimum and maximum number of analytes I can include?

U-PLEX supports 2 to 10 analytes per well. The lower bound of 2 is a practical minimum for multiplexing. The upper bound of 10 is determined by the number of discrete electrode spots available on the U-PLEX plate format. For studies requiring more than 10 analytes, options include: (1) running two complementary U-PLEX panels on the same sample; (2) using a higher-plex V-PLEX panel that covers most of your targets; or (3) a hybrid approach — a V-PLEX panel for broad coverage plus a U-PLEX panel for specific targets not included in the V-PLEX configuration.

Design your own multiplex immunoassay panel — select any 2 to 10 cytokine, chemokine, or immune mediator targets from the U-PLEX catalog and receive a custom-configured multiplex assay with linker-coupled antibodies, without the timeline or cost of custom assay development.

Not every research question fits neatly into a pre-configured V-PLEX panel. U-PLEX addresses this with a modular architecture: each target antibody is coupled to a unique linker that docks to its assigned spot on the MULTI-ARRAY plate. The result is a custom multiplex panel configured to your exact specifications — assembled from off-the-shelf components rather than developed from scratch. Our scientific team evaluates target compatibility, advises on panel design, and confirms feasibility before ordering — ensuring the final panel works as intended.

Design Your Custom Panel How U-PLEX Works

U-PLEX Custom Multiplex Assay Configuration

Traditional custom multiplex assay development can take months and cost tens of thousands of dollars — antibody pairs must be screened for cross-reactivity, spot conditions optimized, and the full panel validated. U-PLEX eliminates this timeline through a modular, linker-based architecture. Each target antibody is pre-coupled to a unique DNA-based linker that directs it to a specific spot on the MSD plate. Since the antibodies are individually qualified and the linker-spot assignment is deterministic, assembling a custom panel is a configuration exercise — not a development project.

 When U-PLEX Is the Right Choice
Your target list doesn't match any pre-configured V-PLEX panel: You need 7 specific analytes spread across three different V-PLEX panels — U-PLEX consolidates them into one assay.
You're adding exploratory targets to a validated core: Run a V-PLEX panel for your primary endpoints and a U-PLEX panel for secondary/exploratory targets — all from the same sample.
Budget or sample volume constraints favor a focused panel: You only need 5 specific cytokines — a 54-plex is overkill. U-PLEX lets you measure exactly what you need, nothing more.
You need species-specific targets not available in pre-configured panels: U-PLEX can draw from a broader catalog including targets validated for mouse, rat, and NHP that may not be available in fixed V-PLEX configurations.

Panel Design Process

Submit your target list — send us the analytes, species, and matrix you plan to use. We verify target availability in the U-PLEX catalog and flag any targets that require alternative sourcing.
Compatibility review — our scientific team evaluates your combination for known interactions, concentration range compatibility, and matrix performance based on existing U-PLEX data for each individual target.
Feasibility confirmation — we confirm the panel can be assembled and provide a project timeline. Most U-PLEX panels ship within 2–3 weeks of order confirmation.
Assay execution — plates are prepared with your custom linker-coupled antibody set. Standard curves, QC samples, and acceptance criteria follow the same framework as V-PLEX assays.

U-PLEX Catalog Scope

The U-PLEX Human Biomarker Group 1 catalog covers 50+ individually qualified targets spanning cytokines (IL-1α through IL-33, 20+ interleukins), chemokines (Eotaxin family, IP-10, MCP-1/2/3/4, MIP-1α/1β/3α/3β/5, MIG, I-TAC, SDF-1α, CTACK, Fractalkine), growth factors (VEGF-A, GM-CSF, G-CSF, M-CSF), soluble receptors, and acute-phase proteins. Mouse, rat, and NHP catalogs provide species-matched coverage for translational studies. Targets not in the current catalog can be evaluated for R-PLEX custom development. Contact us with your analyte list — we'll confirm catalog availability within 1–2 business days.

Custom Panel Configuration — Autoimmune Research Application

A researcher studying psoriatic arthritis needed to measure five analytes not covered by any single V-PLEX panel: IL-17A (Th17 effector), IL-23 (Th17 polarizing), TNF-α (inflammatory), IP-10 (Th1 chemokine), and MIP-3α (CCR6 ligand — Th17 recruitment). These targets were spread across three different V-PLEX panels. Via U-PLEX, all five were combined into a single well, consuming 25 µL per sample instead of the 75 µL that three separate panels would require. The custom panel was assembled and verified within two weeks — no custom development timeline, no minimum order beyond the five-analyte configuration.

U-PLEX Linker-Based Assembly Technology

The modular architecture that makes custom multiplex configuration possible without custom development.

1. Linker-Coupled Antibodies

Each detection antibody is pre-conjugated to a unique DNA-based linker sequence. The linker acts as a molecular address tag — it determines which electrode spot the antibody will bind to on the MULTI-ARRAY plate. Antibodies are individually qualified for sensitivity and specificity before linker coupling.

2. Universal Linker Plate

The U-PLEX plate is pre-coated with complementary linker-capture oligonucleotides at defined spatial positions. When you add your custom mixture of linker-coupled antibodies to the plate, each antibody self-assembles onto its assigned spot through DNA linker hybridization — no covalent coating chemistry required.

3. Standard ECL Readout

Once the antibody-linker-spot assembly is complete, the assay proceeds identically to a V-PLEX or standard MSD assay: add sample, incubate, add SULFO-TAG detection reagent, and read on the MESO QuickPlex or SECTOR instrument. The ECL readout is the same across all MSD product lines.

The linker-based architecture is the key innovation: it decouples panel composition from plate manufacturing, enabling any combination of available targets to be assembled on demand without the coating validation required for fixed-configuration panels.

U-PLEX vs. V-PLEX vs. Custom Development

Choosing the right product line for your cytokine research objectives.

When U-PLEX Is the Best Fit

Your target list of 2–10 analytes does not match any single pre-configured V-PLEX panel
You want to avoid the cost and timeline of fully custom assay development
You need the flexibility to modify your panel composition between studies without switching platforms
Your analytes of interest are available as individual U-PLEX-qualified antibodies in the catalog
You're running a pilot or exploratory study where the final analyte list may evolve based on initial results

U-PLEX Limitations to Consider

Maximum 10 analytes per well — U-PLEX is designed for focused custom panels; for broader profiling, a V-PLEX 30-plex or 54-plex may be more appropriate
Target availability dependent on catalog — not every analyte has a qualified U-PLEX antibody; our team verifies catalog coverage for your target list during the feasibility review
Novel target combinations may require feasibility testing — while individual antibodies are qualified, combinations involving less common targets may benefit from a small-scale compatibility check before full study commitment
Lot-to-lot bridging is antibody-specific rather than panel-wide — because each antibody lot is individually managed, longitudinal bridging requires tracking each component's lot transitions

U-PLEX Custom Panel Service Details

From target list submission to custom-configured data delivery.

U-PLEX Project Workflow

1. Target List Submission

Send us your analytes of interest, species, and sample matrix. We verify U-PLEX catalog availability for each target — typically within 1–2 business days.

2. Feasibility Assessment & Quote

Our scientific team evaluates your target combination for compatibility, provides a feasibility report, and delivers a project quote with timeline. No obligation — the assessment is complimentary.

3. Panel Assembly & Verification

Upon order confirmation, your custom linker-coupled antibody set is assembled. A verification run with calibrators confirms spot assignment and signal generation for each target.

4. Sample Analysis

Samples run on your custom U-PLEX panel following the same QC framework as V-PLEX assays: 8-point standard curves, three-level QC samples, documented acceptance criteria.

5. Data Delivery

Complete data package: per-analyte concentrations, QC metrics, raw ECL data, and a methods summary documenting your custom panel configuration for publication reference.

U-PLEX vs. Other Custom Multiplex Approaches

How linker-based custom configuration compares to alternatives.

Feature	MSD U-PLEX	Bead-Based Custom Premix	Fully Custom Development
Setup Timeline	Days (configuration only)	Days–weeks (bead coupling)	Months (screening + validation)
Max Plex	10 analytes	Up to 50	As validated
Antibody Qualification	Pre-qualified per target	Variable — user-dependent	Developed from scratch
Flexibility to Modify	High — swap individual targets	Moderate — re-couple beads	Low — re-develop panel
Cross-Reactivity Risk	Low — spatially separated spots	Moderate–high — spectral overlap	Validated during development
Best Fit	Focused custom panels, evolving target lists	High-plex screening, budget-constrained	Novel targets, unique requirements

What You Receive

Custom panel quantitative report — concentrations for each configured analyte with per-analyte QC metrics, standard curve parameters, and LOD/LLOQ values (Excel + PDF)
Panel configuration documentation — record of linker-coupled antibody assignments, lot numbers, and spot map for your custom panel — essential for methods sections and repeat orders
Raw ECL data — per-well, per-spot signal values with plate layout maps and individual standard curve plots
Methods summary — detailed protocol describing your custom U-PLEX panel configuration, suitable for publication Methods sections
Feasibility report — documentation of the target compatibility assessment and verification run results for your specific analyte combination

Why Choose U-PLEX

Configure, don't develop: U-PLEX assembles custom panels from pre-qualified, off-the-shelf linker-coupled antibodies — no custom development timeline, no antibody screening, no coating optimization. Target list to verified panel in weeks, not months.
Same ECL chemistry as V-PLEX: your custom U-PLEX panel uses the same SULFO-TAG detection, MULTI-ARRAY plates, and MESO QuickPlex/SECTOR instruments as Pre-configured V-PLEX panels — the only difference is who selects the analytes
Evolve your panel as your research evolves: add, remove, or swap individual targets between studies without affecting the others — a unique advantage over fixed-configuration panels that lock you into a static analyte set
No minimum order beyond the panel: U-PLEX has no custom development fee — you pay for the configured panel, not the development process. Ideal for pilot studies, exploratory research, and grant-funded projects with defined budgets
Feasibility-reviewed before you commit: our scientific team evaluates your target combination for compatibility and flags potential interactions before assembly — reducing the risk of panel performance issues at the data generation stage

U-PLEX Custom Panel FAQ

How do I know if my target list is available in the U-PLEX catalog?

Send us your target list (analytes + species) and we'll verify catalog availability — typically within 1–2 business days. The U-PLEX catalog covers a broad range of cytokines, chemokines, growth factors, and soluble receptors across human, mouse, rat, and NHP. If a specific target is not available as a U-PLEX-qualified antibody, we can discuss alternatives: a different assay format for that target, a complementary V-PLEX panel that covers it, or R-PLEX custom development for truly novel targets.

Can U-PLEX achieve the same sensitivity as V-PLEX or S-PLEX?

U-PLEX assays generally achieve sensitivity comparable to standard MSD assays (pg/mL range) since they use the same ECL detection technology, SULFO-TAG labels, and MULTI-ARRAY plate surface as V-PLEX. However, U-PLEX panels do not include the S-PLEX signal amplification step that enables fg/mL-level detection — for ultra-low-abundance targets requiring maximum sensitivity, a dedicated S-PLEX single-plex assay is recommended. During the feasibility review, our team can advise on expected sensitivity for each of your targets based on existing U-PLEX performance data.

What is the minimum and maximum number of analytes I can include?

U-PLEX supports 2 to 10 analytes per well. The lower bound of 2 is a practical minimum for multiplexing. The upper bound of 10 is determined by the number of discrete electrode spots available on the U-PLEX plate format. For studies requiring more than 10 analytes, options include: (1) running two complementary U-PLEX panels on the same sample; (2) using a higher-plex V-PLEX panel that covers most of your targets; or (3) a hybrid approach — a V-PLEX panel for broad coverage plus a U-PLEX panel for specific targets not included in the V-PLEX configuration.

Can I change my panel composition between studies?

Yes — this is one of U-PLEX's primary advantages. Because each analyte is independently linker-coupled, you can add, remove, or swap individual targets between studies without affecting the others. This is particularly valuable for research programs where the cytokine panel evolves as hypotheses are refined — you might start with a broad 10-plex for discovery, then narrow to a focused 5-plex for validation, all on the same platform. Note that changing panel composition between timepoints within a longitudinal study will prevent direct comparison of the added or removed analytes across those timepoints.

What QC data is provided with a U-PLEX custom panel?

Every U-PLEX assay includes: (1) 8-point standard curve with R² and back-fit accuracy for each analyte; (2) three-level QC samples in duplicate on each plate; (3) intra-plate CV for each analyte; (4) inter-plate CV for multi-plate studies; (5) LOD and LLOQ determination per analyte; (6) raw ECL signal data; (7) dilution linearity verification for your sample matrix. Because U-PLEX panels are not pre-validated as a complete panel, cross-reactivity data for the specific analyte combination may be limited — we discuss this during the feasibility review and can perform a targeted cross-reactivity check if needed for your combination.

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