Ziehl–Neelsen (ZN) Stain – Acid-Fast Bacilli Microscopy Test
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The Ziehl–Neelsen (ZN) Stain is a specialized microscopic staining test designed for the detection of acid-fast bacteria, most notably Mycobacterium tuberculosis. This classic laboratory test allows microbiologists and healthcare professionals to clearly identify TB-causing organisms and other mycobacterial infections with precision.
Key Elements / Features:
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Detects acid-fast bacteria in clinical specimens such as sputum and tissue
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Uses carbol fuchsin dye, acid-alcohol decolorization, and methylene blue counterstain
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Visualizes acid-fast bacteria as bright red rods against a blue cellular background
Key Benefits
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Enables accurate tuberculosis diagnosis
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Supports identification of other mycobacterial infections
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Serves as a reliable reference for lab-based microscopy
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Enhances medical education and laboratory training
Formula Highlights
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Heat-assisted carbol fuchsin dye penetration
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Acid-alcohol decolorization removes non–acid-fast cells
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Methylene blue counterstain provides contrasting background
Usage Instructions
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Collect sample: sputum, tissue, or other clinical specimens
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Apply staining protocol as per lab standards
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Observe under microscope; acid-fast bacteria appear bright red
Additional Information
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Type: Laboratory microscopic staining test
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Ideal for microbiology labs, medical students, and diagnostic centers
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Visual reference: classic red-on-blue AFB appearance
What You Receive
Safety & Care
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Handle reagents with proper lab safety protocols
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Avoid direct contact with skin or eyes
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Dispose of samples and reagents according to biohazard guidelines
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