Leica HistoCore CHROMAX ST Automated Tissue Stainer

Overview

The Leica HistoCore CHROMAX ST is a fully automated, high-throughput tissue stainer engineered for precision, reproducibility, and compliance in diagnostic histopathology laboratories. Based on programmable reagent delivery, timed immersion, and temperature-controlled staining protocols, the system implements standardized wet chemistry workflows grounded in validated histochemical principles—including hematoxylin and eosin (H&E) staining kinetics, oxidation states of hematoxylin, differential acid–base binding affinities, and controlled eosin counterstaining dynamics. Designed for routine and specialized staining across diverse tissue morphologies—from fatty, necrotic, or calcified specimens to delicate biopsies—the CHROMAX ST delivers consistent nuclear chromatin definition, crisp cytoplasmic differentiation, and reliable connective tissue contrast across the first to the 3,000th slide in a single run. Its architecture supports ISO 15189-aligned quality management systems and integrates seamlessly into laboratory workflows governed by CAP, CLIA, and GLP requirements.

Key Features

• Pre-validated, factory-installed Leica H&E staining protocols—optimized for reproducible nuclear basophilia and cytoplasmic eosinophilia across variable tissue fixation and processing histories.
• Intelligent reagent management system with real-time tracking of reagent volume, usage cycles, expiration dates, and lot-specific traceability—generating automated replacement alerts and audit-ready logs.
• Multi-rack concurrent processing: up to four slide racks (including optional 1+3 loading station configuration) operated independently with individual progress monitoring, remaining time estimation, and dynamic status visualization via the 10.1-inch capacitive touchscreen interface.
• Slide counting and statistical reporting module—automatically records stained slide counts per batch, reagent consumption per cycle, downtime events, and operator-initiated interventions for QC documentation and cost-per-slide analysis.
• Modular open-platform design supporting H&E, special stains (e.g., Masson’s trichrome, PAS, Alcian blue), cytology preparations, and large-format slides (up to 50 × 75 mm) without hardware modification.
• Miniature 125 mL reagent containers—reducing reagent waste and consumables cost for low-volume or pilot-study staining runs while maintaining protocol fidelity through calibrated fluidics and precise dwell-time control.

Sample Compatibility & Compliance

The CHROMAX ST accommodates standard 1 x 3 inch (25 × 75 mm) glass slides, as well as extended formats used in dermatopathology and neuropathology. It accepts paraffin-embedded tissue sections (3–5 µm thickness), frozen sections (5–10 µm), and cytology smears processed via conventional alcohol-based dehydration. All staining protocols are developed and verified in accordance with ASTM E2917 (Standard Practice for Validation of Analytical Methods Used in Clinical Laboratories) and align with College of American Pathologists (CAP) checklist requirements for automated staining validation. The system supports full traceability per FDA 21 CFR Part 11 when paired with Leica Biosystems’ certified software packages, including electronic signature capability, user access controls, and immutable audit trails for all staining events, reagent changes, and parameter modifications.

Software & Data Management

Controlled via Leica’s proprietary CHROMAX OS firmware, the instrument features embedded data logging compliant with ISO/IEC 17025 and CLIA regulatory expectations. All staining runs generate timestamped metadata—including start/end times, reagent lots, rack IDs, temperature profiles, and error flags—which export directly to LIS/HIS platforms via HL7 v2.5 or CSV. The system supports scheduled maintenance reminders, firmware update notifications, and remote diagnostics via secure TLS-encrypted connection. Optional integration with Leica CV5030 coverslipper enables unattended end-to-end slide processing (stain → cover) within a single workflow—fully documented under GMP-aligned change control procedures.

Applications

• Routine diagnostic H&E staining in high-volume surgical pathology labs.
• Validation and implementation of novel or modified staining protocols for biomarker assay development.
• Special stain automation for infectious disease workups (e.g., AFB, GMS), fibrosis assessment (Sirius Red), and mucin characterization (Alcian blue/PAS).
• Research-grade staining consistency across multi-center studies requiring inter-laboratory harmonization.
• Training and competency assessment—standardized staining reduces inter-operator variability during staff onboarding.

FAQ

Does the CHROMAX ST support custom staining protocols?
Yes—users can create, save, and validate custom programs using the built-in editor, with full parameter control over incubation time, temperature, agitation mode, and reagent sequence.
Is third-party reagent compatibility validated?
Leica validates only its own CE-IVD and FDA-cleared reagents; use of non-Leica reagents voids warranty and may compromise compliance with CAP/CLIA standards.
Can staining data be exported for regulatory audits?
Yes—all run logs, reagent history, user actions, and system events are stored in encrypted binary format and exportable as PDF or CSV with digital signature support.
What is the maximum throughput per day?
With continuous operation and optimized rack loading, the system processes up to 480 slides per 8-hour shift (based on standard 12-rack capacity and 6-minute average cycle time).
Is service and technical support available globally?
Leica Biosystems provides regional field service engineers, remote diagnostics, and 24/7 application support through authorized service partners in over 100 countries.