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In vitro diagnostics (IVD) modern evidence-based clinical medicine ka primary pillar hain. Over 70% of all therapeutic and clinical treatment decisions laboratory investigations par depend karte hain. Serological assays, specifically Enzyme-Linked Immunosorbent Assays (ELISA) aur Lateral Flow Rapid Diagnostic Tests (RDTs), infectious diseases (Dengue, Malaria, HIV, Hepatitis B & C) ke diagnosis aur epidemiological screening mein vital role play karte hain.
NABL (ISO 15189:2022) accredited pathology laboratories aur tertiary diagnostic facilities ke liye test accuracy, cold-chain integrity (2°C to 8°C), aur lot-to-lot coefficient of variation (CV%) maintain karna statutory requirement hai. Is 2026 clinical guide mein hum rapid diagnostic test kits, ELISA microplate quality control, validation protocols, aur standard operating procedures (SOPs) ko detail karenge.
1 Diagnostic Modality Comparison: Rapid Test Cards vs Microplate ELISA
| Technical Parameter | Lateral Flow Rapid Test Cards (RDTs) | Microplate Enzyme Immunoassay (ELISA) |
|---|---|---|
| Principle & Detection | Capillary immunochromatography with colloidal gold / selenium conjugates | Enzyme-substrate colorimetric absorbance (Horseradish Peroxidase / TMB) |
| Turnaround Time (TAT) | 15 to 20 minutes (Point-of-Care) | 2.5 to 4.5 hours (Batch Processing) |
| Sensitivity & Limit of Detection (LoD) | Moderate to High (ideal for acute symptomatic screening) | Extremely High (picogram/femtogram level analytical sensitivity) |
| Equipment Requirement | Zero instrumentation; visual naked-eye band interpretation | Microplate Reader (Spectrophotometer at 450/630 nm) & Automated Washer |
| Storage & Cold-Chain Sensitivity | 2°C to 30°C (High field stability, e.g. SD Biosensor Malaria) | Strict 2°C to 8°C refrigerated storage throughout supply chain |
| Typical Pricing in India | ₹40 – ₹90 per individual test card | ₹1,800 – ₹4,500 per 96-well kit (₹20-₹45/test) |
2 Quality Assurance & Cold-Chain Management (2°C to 8°C)
Diagnostic assays me antibody-antigen binding affinity biological proteins par dependent hoti hai jo thermal fluctuations se denature ho sakti hain:
- Continuous Temperature Logging: Reagent storage refrigerators must be equipped with digital data loggers or calibrated dual-probe thermometers recording temperature twice daily. Excursions above 8°C or below 2°C compromise enzyme conjugate activity.
- Desiccant Integrity in Rapid Cards: Lateral flow strips contain silica desiccant pouches. Foil pouches must never be opened prematurely; exposure to atmospheric ambient humidity >60% causes non-specific conjugate aggregation and false-positive control line failures.
- Lot-to-Lot Verification (ISO 15189): Prior to introducing a new manufacturing batch into routine patient reporting, labs must run 5 known positive and 5 known negative samples to verify concordant sensitivity and specificity against the existing lot.
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