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KOH String Test is a rapid bedside/lab test used to differentiate Gram-negative from Gram-positive bacteria without performing Gram stain. 🧪 How it works: Mix a colony with 3% KOH on a slide Gently lift with a loop or stick 🧬 Result interpretation: 🧵 String formation (viscous, sticky thread) → Gram-negative ✅ 👉 Cell wall breaks → DNA released ❌ No string → Gram-positive ⚡ Why it’s useful: Faster than Gram stain Helpful when Gram stain is unclear Great for teaching & quick screening 📌 Rememb
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KOH String Test is a rapid bedside/lab test used to differentiate Gram-negative from Gram-positive bacteria without performing Gram stain. 🧪 How it works: Mix a colony with 3% KOH on a slide Gently lift with a loop or stick 🧬 Result interpretation: 🧵 String formation (viscous, sticky thread) → Gram-negative ✅ 👉 Cell wall breaks → DNA released ❌ No string → Gram-positive ⚡ Why it’s useful: Faster than Gram stain Helpful when Gram stain is unclear Great for teaching & quick screening 📌 Rememb
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Why KOH is Important in the Microbiology Lab 🧫 1️⃣ KOH Scraping Method Used for skin, hair, and nail samples. KOH dissolves keratin → fungal hyphae and yeast become clearly visible. 👉 Essential for rapid diagnosis of fungal infections. 2️⃣ Whiff Test Add 10% KOH to vaginal discharge. Fishy (amine) odor = suggestive of Bacterial Vaginosis. 👉 Simple bedside clue. 3️⃣ KOH String Test Mix colony with 3% KOH. String formation = Gram-negative. No string = Gram-positive. 👉 Quick alternative to Gram
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Would you lick your kitchen sink? Did you know that it's THE most unhygienic area in your home? The WORST thing is... these germs and bacteria may still be living on your "clean" dishes and utensils...🤮🤮🤮 That's why Koh's dishwashing products contain enzymes that penetrate deeper to lift food residue and stains so you have a more hygienic clean! It's also... 🌸 Fragrance-free 💪 Faster working 🌿 Gentle on skin | Koh
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