{"id":7703,"date":"2025-11-14T19:08:26","date_gmt":"2025-11-14T11:08:26","guid":{"rendered":"https:\/\/ozellemed.com\/?p=7703"},"modified":"2025-12-09T18:37:57","modified_gmt":"2025-12-09T10:37:57","slug":"blood-analyzer-comparison-guide-3-diff-vs-7-diff-hematology-analyzers","status":"publish","type":"post","link":"https:\/\/ozellemed.com\/en\/blood-analyzer-comparison-guide-3-diff-vs-7-diff-hematology-analyzers\/","title":{"rendered":"Blood Analyzer Comparison Guide: 3-Diff vs. 7-Diff Hematology Analyzers"},"content":{"rendered":"\n<p>Selecting a blood analyzer is a critical investment decision for healthcare facilities. Laboratory managers, clinic directors, and procurement specialists must evaluate not just product models, but the fundamental analytical approach: traditional Complete Blood Count (CBC) methods that provide quantitative data alone, or AI-powered Complete Blood Morphology (CBM) systems that integrate visual cell analysis for superior diagnostic insight. This guide compares Ozelle&#8217;s 3-diff and 7-diff hematology analyzers based on verified specifications and clinical capabilities, helping decision-makers understand how advanced morphology analysis translates into better clinical outcomes and operational efficiency.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-understanding-blood-analyzer-classification\">Understanding Blood Analyzer Classification<\/h2>\n\n\n\n<p>3-Diff Analyzers identify three main white blood cell categories: granulocytes, lymphocytes, and mid-range cells, providing sufficient information for routine primary care screening. These analyzers achieve lab-grade linearity with R\u00b2 values of 0.99 and maintain precision (coefficient of variation) of 3-6% for major parameters, meeting clinical quality standards for basic diagnostic needs.<\/p>\n\n\n\n<p>7-Diff Analyzers distinguish seven distinct cell populations and abnormal cells including immature neutrophils (NST), nuclear-shifted granulocytes (NSG), and reticulocytes (RET), enabling detection of hematologic disorders, severe infections, and bone marrow conditions. These advanced analyzers deliver superior detection accuracy through AI-driven cell morphology imaging\u2014capturing high-resolution cell images for visual analysis\u2014rather than relying on impedance-only methods. They achieve R\u00b2 linearity values exceeding 0.98 across all parameters and deliver results within 6 minutes, providing the morphological insight required for complex clinical cases traditionally requiring manual microscopy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-technology-traditional-cbc-vs-ai-powered-complete-blood-morphology-cbm\">Technology: Traditional CBC vs. AI-Powered Complete Blood Morphology (CBM):<\/h2>\n\n\n\n<p>Traditional Complete Blood Count (CBC) analyzers deliver quantitative data\u2014cell counts and indices\u2014but cannot assess cell morphology or identify abnormal cellular characteristics. These limitations require manual microscopy for complex cases. Ozelle&#8217;s AI-driven Complete Blood Morphology (CBM) integrates quantitative CBC parameters with AI-powered visual cell analysis, enabling automated detection of abnormal cells within 6 minutes, eliminating the need for manual microscopy in most routine cases.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ehbt-75-7-diff-specialized-hematology-analyzer\"><a href=\"https:\/\/ozellemed.com\/en\/auto-hematology-analyzer\/\">EHBT-75: 7-Diff Specialized Hematology Analyzer<\/a><\/h2>\n\n\n\n<p>Best For: Academic medical centers, hematology-oncology practices, specialized diagnostic laboratories<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-official-specifications\">Official Specifications:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Principle: Cell morphology (CBC), photoelectric colorimetry (HGB)<\/li>\n\n\n\n<li>Parameters: 37 CBC parameters with advanced abnormal detection<\/li>\n\n\n\n<li>Testing Modules: Hematology only (no multi-functional testing)<\/li>\n\n\n\n<li>Throughput: 10 samples\/hour<\/li>\n\n\n\n<li>Sample Volume: 30-60 microliters for loading; 30 microliters for testing<\/li>\n\n\n\n<li>Result Time: 6 minutes for morphological report<\/li>\n\n\n\n<li>Dimensions: 415 \u00d7 203 \u00d7 483 mm (compact design)<\/li>\n\n\n\n<li>Weight: 15 kg<\/li>\n\n\n\n<li>Calibration: Auto-calibration<\/li>\n\n\n\n<li>Quality Control: Dry-type QC cards<\/li>\n\n\n\n<li>Display: 7.0-inch touch screen (1024 \u00d7 600 resolution)<\/li>\n\n\n\n<li>Communication: USB, Ethernet, WiFi, Bluetooth<\/li>\n\n\n\n<li>Power: AC 100-240V, 50-60Hz<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-distinguishing-features\">Distinguishing Features:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Specialized for CBC-focused laboratories<\/li>\n\n\n\n<li>Single-use cartridges stored at room temperature (12-month shelf life)<\/li>\n\n\n\n<li>Liquid-based staining technology for enhanced cell visualization<\/li>\n\n\n\n<li>Advanced morphology image capture with cell counts<\/li>\n\n\n\n<li>Automated sample processing with minimal operator involvement<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-clinical-applications\">Clinical Applications:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Leukemia and hematologic malignancy screening<\/li>\n\n\n\n<li>Hemolytic anemia assessment (through RET enumeration)<\/li>\n\n\n\n<li>Infection severity evaluation (through abnormal cell detection)<\/li>\n\n\n\n<li>Chemotherapy monitoring<\/li>\n\n\n\n<li>Bone marrow disorder investigation<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ehbt-50-7-diff-multi-functional-analyzer\"><a href=\"https:\/\/ozellemed.com\/en\/multi-functional-analyzer\/\">EHBT-50: 7-Diff Multi-Functional Analyzer<\/a><\/h2>\n\n\n\n<p>Best For: Hospitals, diagnostic centers, large clinic networks, facilities requiring multiple testing modalities<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-official-specifications-0\">Official Specifications:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Principle: Cell morphology (CBC), photoelectric colorimetry (HGB), immunofluorescence assay (IF), dry chemistry (biochemistry)<\/li>\n\n\n\n<li>Parameters: 37 CBC parameters plus 100+ immunoassay and biochemistry markers<\/li>\n\n\n\n<li>Testing Modules: All-in-one (hematology + immunoassay + biochemistry + urine + fecal)<\/li>\n\n\n\n<li>Throughput: 10 samples\/hour<\/li>\n\n\n\n<li>Sample Volume: 30-100 microliters depending on test panel<\/li>\n\n\n\n<li>Result Time: 6 minutes for morphological CBC report<\/li>\n\n\n\n<li>Dimensions: 350 \u00d7 400 \u00d7 450 mm<\/li>\n\n\n\n<li>Weight: 15 kg<\/li>\n\n\n\n<li>Calibration: Auto-calibration<\/li>\n\n\n\n<li>Quality Control: Dry-type QC cards<\/li>\n\n\n\n<li>Display: 10.1-inch touch screen (800 \u00d7 1280 resolution)<\/li>\n\n\n\n<li>Communication: LIS\/HIS, WiFi, Ethernet, USB 2.0, Bluetooth, Type C, SIM port<\/li>\n\n\n\n<li>Connectivity: Over-the-air (OTA) software updates for new assay panels<\/li>\n\n\n\n<li>Power: AC 100-240V, 50-60Hz<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-7-diff-cbc-capabilities-37-parameters\">7-Diff CBC Capabilities (37 Parameters):<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Standard differential: NEU, LYM, MON, EOS, BAS<\/li>\n\n\n\n<li>Abnormal cells: NST, NSG, NSH, NLR, PLR, ALY, PAg, RET<\/li>\n\n\n\n<li>Additional: WBC, RBC, HGB, HCT, MCV, MCH, MCHC, RDW-SD, RDW-CV, PLT, MPV, PDW, PCT, P-LCR, P-LCC<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-multi-functional-testing\">Multi-Functional Testing :<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Immunoassay: Cardiac (troponin, BNP), inflammation (CRP, SAA), hormone markers, infectious disease serology<\/li>\n\n\n\n<li>Biochemistry: Glucose, lipids, liver function, kidney function<\/li>\n\n\n\n<li>Urine: Complete urinalysis with microscopy<\/li>\n\n\n\n<li>Fecal: Analysis and parasite detection<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-key-advantages\">Key Advantages:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Consolidates 4-5 separate analyzers into one device<\/li>\n\n\n\n<li>Reduces capital equipment costs and space requirements<\/li>\n\n\n\n<li>Lab-grade linearity specifications (R\u00b2 >0.98 for all parameters)<\/li>\n\n\n\n<li>Auto-calibration (no operator intervention)<\/li>\n\n\n\n<li>Individual test kits eliminate maintenance<\/li>\n\n\n\n<li>OTA updates enable future assay expansion<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-clinical-value\">Clinical Value:<\/h3>\n\n\n\n<p>Identifies immature and abnormal cell populations enabling earlier detection of leukemia, severe infections, hemolytic anemias, and bone marrow disorders.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ehbt-25-3-diff-entry-level-analyzer\"><a href=\"https:\/\/ozellemed.com\/en\/cell-morphology-hematology-analyzer\/\">EHBT-25: 3-Diff Entry-Level Analyzer<\/a><\/h2>\n\n\n\n<p>Best For: Primary care clinics, urgent care centers, pharmacies, small diagnostic facilities<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-official-specifications-1\">Official Specifications:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Principle: Cell morphology, photoelectric colorimetry<\/li>\n\n\n\n<li>Parameters: 21 (WBC, GRAN, LYMPH, MID, HGB, RBC, HCT, MCV, MCH, MCHC, RDW-SD, RDW-CV, PLT, PCT, MPV, P-LCC, P-LCR, PDW plus 3 histograms)<\/li>\n\n\n\n<li>Throughput: 12 samples\/hour<\/li>\n\n\n\n<li>Sample Volume: 40 microliters (capillary or venous whole blood)<\/li>\n\n\n\n<li>Result Time: ~60 seconds per sample<\/li>\n\n\n\n<li>Dimensions: 293 \u00d7 357 \u00d7 400 mm<\/li>\n\n\n\n<li>Weight: 8.1 kg<\/li>\n\n\n\n<li>Calibration: Manual<\/li>\n\n\n\n<li>Quality Control: Dry-type QC cards<\/li>\n\n\n\n<li>Display: 10.1-inch touch screen (1280 \u00d7 800 resolution)<\/li>\n\n\n\n<li>Communication: LIS, USB 2.0, LAN<\/li>\n\n\n\n<li>Power: AC 100-240V, 50-60Hz<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-key-features\">Key Features:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Individual test kits (no pipeline design)\u2014zero maintenance required<\/li>\n\n\n\n<li>Room temperature storage for reagents<\/li>\n\n\n\n<li>Capillary blood collection from fingerstick<\/li>\n\n\n\n<li>Lab-grade linearity (R\u00b2 >0.99 for WBC, RBC, platelet counts)<\/li>\n\n\n\n<li>NPT certified for pharmacy use<\/li>\n\n\n\n<li>Economical and maintenance-free operation<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-clinical-value-0\">Clinical Value:<\/h3>\n\n\n\n<p>AI-enhanced 3-diff capability provides superior abnormal cell detection compared to impedance-only analyzers, suitable for most primary care patients.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ozelle-blood-analyzer-comparison-table\">Ozelle Blood Analyzer Comparison Table<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Feature<\/td><td>EHBT-25<\/td><td>EHBT-50<\/td><td>EHBT-75<\/td><\/tr><tr><td>Differential Capability<\/td><td>3-diff<\/td><td>7-diff + abnormal<\/td><td>7-diff + abnormal<\/td><\/tr><tr><td>Throughput (samples\/hour)<\/td><td>12<\/td><td>10<\/td><td>10<\/td><\/tr><tr><td>Sample Volume<\/td><td>40 \u00b5L<\/td><td>30-100 \u00b5L<\/td><td>30 \u00b5L<\/td><\/tr><tr><td>CBC Parameters<\/td><td>21<\/td><td>37<\/td><td>37<\/td><\/tr><tr><td>Multi-Functional<\/td><td>CBC only<\/td><td>Hematology + Immunoassay + Biochemistry + Urine + Fecal<\/td><td>CBC only<\/td><\/tr><tr><td>Abnormal Cell Detection<\/td><td>Basic<\/td><td>Advanced<\/td><td>Advanced<\/td><\/tr><tr><td>Result Time<\/td><td>60 seconds<\/td><td>6 minutes<\/td><td>6 minutes<\/td><\/tr><tr><td>Maintenance<\/td><td>Zero<\/td><td>Zero<\/td><td>Zero<\/td><\/tr><tr><td>Calibration<\/td><td>Manual<\/td><td>Automatic<\/td><td>Automatic<\/td><\/tr><tr><td>Result Time (7-Diff Report)<\/td><td>N\/A<\/td><td>6 min<\/td><td>6 min<\/td><\/tr><tr><td>Auto-Calibration<\/td><td>Manual<\/td><td>Yes<\/td><td>Yes<\/td><\/tr><tr><td>Regulatory Status<\/td><td>CE, FDA<\/td><td>CE, FDA<\/td><td>CE, FDA<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Blood Analyzer Maintenance and Operational Design<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Maintenance-Free Architecture:<\/h4>\n\n\n\n<p>All analyzers use individual test kits rather than traditional pipeline designs. Each kit contains:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pre-filled diluent<\/li>\n\n\n\n<li>Staining reagent<\/li>\n\n\n\n<li>Counting chamber<\/li>\n\n\n\n<li>Disposable collection capillary<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Advantages:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No daily priming or cleaning procedures<\/li>\n\n\n\n<li>No cross-contamination between samples<\/li>\n\n\n\n<li>No blockages or clogging<\/li>\n\n\n\n<li>Room temperature storage (cold-chain free)<\/li>\n\n\n\n<li>Reduced staff training requirements<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Quality Control:<\/h4>\n\n\n\n<p>All analyzers use dry-type QC cards, eliminating refrigeration requirements and improving logistical efficiency compared to liquid QC materials.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/ozellemed.com\/en\/\">Blood Analyzer Vendor Information<\/a><\/h3>\n\n\n\n<p>About Ozelle:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Founded: 2014<\/li>\n\n\n\n<li>Headquarters: Frankfurt, Germany<\/li>\n\n\n\n<li>Global Presence: 50,000+ units installed across 100+ countries<\/li>\n\n\n\n<li>Staff: 500+ employees with 60+ dedicated R&amp;D personnel<\/li>\n\n\n\n<li>Certifications: CE marking, FDA clearance, ISO 13485:2016, ISO 15189<\/li>\n\n\n\n<li>Patents: 500+ patents in diagnostic technology<\/li>\n\n\n\n<li>Technology Recognition: World Artificial Intelligence Conference (WAIC) 2022 award for AI algorithm<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Blood Analyzer of Clinical Decision Framework<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Select EHBT-25 When:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Patient population primarily requires routine screening<\/li>\n\n\n\n<li>Facility operates 500-2,000 tests annually<\/li>\n\n\n\n<li>Budget constraints favor economical solutions<\/li>\n\n\n\n<li>Space is limited<\/li>\n\n\n\n<li>Maintenance overhead must be minimized<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Select EHBT-50 When:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Multi-functional testing (hematology, immunoassay, biochemistry) is required<\/li>\n\n\n\n<li>Space optimization is important (consolidating multiple devices)<\/li>\n\n\n\n<li>Hospital or diagnostic laboratory setting<\/li>\n\n\n\n<li>OTA update capability for future assay expansion is valued<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Select EHBT-75 When:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Specialized hematology focus with abnormal cell detection priority<\/li>\n\n\n\n<li>Complex case management requiring 7-diff capability<\/li>\n\n\n\n<li>Image-based morphology documentation is critical<\/li>\n\n\n\n<li>Compact footprint is required<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Key Differentiation: AI Cell Morphology vs. Traditional Methods<\/h3>\n\n\n\n<p>Ozelle&#8217;s AI-enhanced analyzers provide verifiable advantages:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Linearity Accuracy: Lab-grade specifications with R\u00b2 values >0.98-0.99 across measurement ranges<\/li>\n\n\n\n<li>Abnormal Detection: Visual cell image capture enables morphology analysis traditional impedance analyzers cannot provide<\/li>\n\n\n\n<li>Quality Assurance: Cell images retained with results for quality verification and medicolegal documentation<\/li>\n\n\n\n<li>Operator Consistency: AI-based recognition eliminates operator-dependent variability<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Blood analyzer selection requires matching analytical capability with clinical requirements and operational constraints. Ozelle&#8217;s product portfolio addresses diverse market segments:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>EHBT-25: Primary care and point-of-care settings prioritizing economy and simplicity<\/li>\n\n\n\n<li>EHBT-50: Hospital and diagnostic laboratories benefiting from multi-functional consolidation<\/li>\n\n\n\n<li>EHBT-75: Specialized hematology practices requiring advanced abnormal cell detection<\/li>\n\n\n\n<li>EHVT-50: Veterinary clinics requiring species-specific diagnostics<\/li>\n<\/ul>\n\n\n\n<p>All analyzers share core advantages: AI-powered cell morphology analysis, individual test kit design (zero maintenance), dry-type QC cards, and proven clinical validation through 50,000+ global installations.<\/p>\n\n\n\n<p>For pricing, service agreements, and facility-specific recommendations,<a href=\"https:\/\/ozellemed.com\/en\/about-us\/\"> contact Ozelle <\/a>directly for consultation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Selecting a blood analyzer is a critical investment decision for healthcare facilities. Laboratory managers, clinic directors, and procurement specialists must evaluate not just product models, but the fundamental analytical approach: traditional Complete Blood Count (CBC) methods that provide quantitative data alone, or AI-powered Complete Blood Morphology (CBM) systems that integrate visual cell analysis for superior [&hellip;]<\/p>\n","protected":false},"author":42,"featured_media":8022,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[24],"tags":[],"class_list":["post-7703","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-24"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.8 (Yoast SEO v25.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Blood Analyzer Comparison: 3-Diff vs. 7-Diff Hematology<\/title>\n<meta name=\"description\" content=\"Compare 3-diff vs. 7-diff blood analyzers. 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