PRF Blood Collection Protocol
For PRF preparation, collect blood in special glass tubes or plastic tubes with silica coating (NOT anticoagulant tubes), and centrifuge immediately at 408g for at least 12 minutes after the last tube is loaded. 1
Blood Collection Tube Selection
- Use specialized coagulation-promoting tubes - either glass tubes or plastic tubes coated internally with silica layer 1
- Titanium tubes (T-PRF) are an acceptable alternative 1
- Do NOT use anticoagulant tubes - PRF relies on natural coagulation, unlike PRP which requires citrate anticoagulants 1
- Collect 4-8 tubes of 9-10 mL blood volume 1
Critical Distinction from PRP
PRF fundamentally differs from PRP in that it requires natural clotting without anticoagulants, whereas PRP uses citrate anticoagulation 2, 3. This is why tube selection is absolutely critical - using the wrong tube type will prevent proper PRF formation.
Blood Draw Technique
- Use a 21-gauge butterfly needle preferably 1
- Rotate tubes immediately after blood draw to increase contact between inner tube surface and blood, accelerating coagulation 1
- Place first two tubes immediately in centrifuge opposite each other for balance 1
- Start centrifugation immediately with first two tubes 1
Centrifugation Timing Protocol
The timing is critical and differs from standard blood processing:
- Begin centrifugation immediately - do not delay 1
- While centrifuge runs, continue drawing additional tubes 1
- Stop centrifuge when fourth tube is half-filled, add new tubes, then restart 1
- Centrifuge at 408g (relative centrifugal force) for minimum 12 minutes counted from when the LAST tube is loaded 1
- For patients on anticoagulant medication, extend to 18-20 minutes 1
Why Immediate Processing Matters
Unlike PRP which can be processed within 1-4 hours 2, 3, 4, PRF requires immediate centrifugation because natural coagulation begins instantly upon blood draw. Any delay compromises the fibrin matrix formation that defines PRF's therapeutic properties 1.
Key Technical Considerations
- Ensure centrifuge is on a stable table to prevent vibration 1
- Consider the radius of your specific centrifuge when calculating g-force 1
- Different PRF modifications (A-PRF, A-PRF+, CGF, H-PRF) may use different g-forces and times 1
- After centrifugation, carefully separate PRF clot from red blood cells without cutting away the buffy coat layer - this is the most biologically active portion 1
Common Pitfalls to Avoid
- Never use EDTA or citrate tubes - these prevent the natural coagulation essential for PRF 1
- Do not delay centrifugation - coagulation begins immediately 1
- Do not confuse PRF protocols with PRP protocols - they are fundamentally different in tube type and anticoagulation 2, 3
- Ensure proper tube filling and immediate rotation after draw 1