10/04/2026
In the world of diagnostics, every tube tells a story' BradleyVacutube
From blue-top for glucose to red-top for serum, each vial plays its role in saving lives. ❤️
Behind every report is precision, dedication, and the silent work of lab professionals.
Do you love labs? Because we don’t just test samples… we uncover truths. 🔬
Which vail color is your favorite color?
🧪 Significance of Blood Collection Tube Colors
Each colored top tube is not just for identification—it contains specific additives that make it suitable for particular tests:
Grey top (Sodium Fluoride / Oxalate)
Used mainly for glucose testing. Sodium fluoride inhibits glycolysis, preventing glucose breakdown and ensuring accurate sugar levels.
🔴 Red Top (Plain / Clot Activator)
Used for serum-based tests like biochemistry, serology, and hormone assays. It allows blood to clot, and serum is then separated.
🟣 Purple/Lavender Top (EDTA)
Used for hematology tests such as CBC, ESR, and blood film. EDTA prevents clotting by binding calcium, preserving cell morphology.
🟡 Yellow Top (Gel / Serum Separator)
Used for biochemistry and immunology tests. It contains gel that separates serum from cells after centrifugation.
🟢 Green Top (Heparin)
Used for plasma tests like electrolytes and some chemistry tests. Heparin prevents clotting by inhibiting thrombin.
⚫ Black Top (Sodium Citrate – ESR)
Specifically used for ESR (Erythrocyte Sedimentation Rate) testing.
🔵 Blue Top (Sodium Citrate - Pt and Aptt)
Specifically used for Pt and Aptt testing.
🧠 Why it matters?
Using the wrong tube can give incorrect results, leading to misdiagnosis. That’s why proper tube selection is critical in laboratory practice.
💉 Right tube = Right result = Right diagnosis
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