Dr. Tareq Abadl/LinkedIn
Nov 11, 2025, 11:02
Sodium Citrate 1:9 vs 1:4 – Key Lab Tip for Accurate Results
Tareq Abadl, Medical Laboratory Specialist and Director of the Blood Bank at Dr. Abdelkader Al-Mutawakkil Hospital, posted on LinkedIn:
”Quick Tip: Sodium Citrate Tubes.
There are two types of sodium citrate tubes, depending on the concentration of the anticoagulant:
1. For coagulation tests (e.g., PT and PTT) → Sodium citrate ratio 1:9
2. For ESR tests (Erythrocyte Sedimentation Rate) → Sodium citrate ratio 1:4
Important Tips:
- Fill the tube completely up to the black mark for accurate results.
- Gently invert the tube several times after blood collection to mix the blood with the anticoagulant.
- Store tubes at room temperature before testing.
- Avoid direct sunlight and high temperatures to preserve sample integrity.”
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