What is the recommended protocol for preparing and injecting liquid platelet‑rich fibrin (liquid PRF) in aesthetic medicine for facial rejuvenation?

Liquid PRF Protocol for Facial Rejuvenation in Aesthetic Medicine

For facial rejuvenation, administer 3 monthly intradermal injections of liquid PRF (i-PRF) at 21-day intervals, targeting the malar areas (1 mL per side), nasolabial folds (0.5 mL per side), and upper lip (1 mL total), using a 27-gauge needle or microcannula for intradermal delivery into the deep dermis. 1, 2

Blood Collection and Preparation Protocol

Critical Timing Requirements

• Collect blood in plastic non-coated tubes (NOT silica-coated or glass tubes used for solid PRF) using a 21G butterfly needle. 1
• Begin centrifugation within 60-120 seconds of blood draw—delays beyond this destroy the specific cellular content and matrix architecture. 3, 4
• Centrifuge at 700 rpm (approximately 60g RCF) for 3-8 minutes depending on protocol. 1, 4

Preparation Steps for Liquid PRF

1. Draw 4-6 tubes (9-10 mL each) of blood into plastic non-coated tubes, rotating tubes immediately after collection. 1
2. Place tubes in centrifuge immediately (within 60-120 seconds) at 700 rpm for 8 minutes (C-PRF protocol) or 3-4 minutes for faster preparation. 1, 4
3. After centrifugation, aspirate the yellow liquid PRF layer with a plastic syringe, avoiding the red blood cell layer. 1
4. Use within 15-30 minutes of preparation, or extend working time to 90+ minutes by placing tubes in a cooling device (Bio-Cool) immediately after centrifugation. 5

Common Pitfalls to Avoid

• Never use silica-coated or glass tubes for liquid PRF—these are only for solid PRF/membranes and will cause premature clotting. 1, 4
• Slow blood collection (>2 minutes total) destroys cellular content—work quickly and efficiently. 3, 4
• Centrifuge vibration significantly impacts cell content—ensure the centrifuge sits on a stable table. 1, 3
• Room temperature must be ≥21°C during preparation—cold temperatures affect clotting kinetics. 3, 5

Treatment Protocol and Administration

Standard Injection Technique

• Perform 3 treatment sessions spaced 21-30 days apart as the standard protocol. 1, 2
• Inject intradermally into the deep dermis or superficial subcutaneous layer using a 27-gauge needle or 25-27 gauge blunt-tip microcannula. 1, 6
• Insert needle at 10-15 degrees with bevel facing upward, injecting slowly and pausing 5-10 seconds before withdrawal. 6
• Distribute volume as follows: malar areas (1 mL each side), nasolabial folds (0.5 mL each side), upper lip skin (1 mL total). 1, 2

Maintenance and Follow-Up

• Schedule maintenance treatments every 6 months following the initial 3-session course to sustain rejuvenation effects. 7, 6
• Assess outcomes at 3 months post-treatment using objective measures (VISIA skin analysis) and patient-reported outcomes (FACE-Q scales). 2

Expected Clinical Outcomes

Evidence-Based Improvements

• Skin thickness and dermal density show the strongest evidence of improvement (80% of studies report significant gains), with statistically significant increases in dermal thickness at the glabella, frontal areas, and cheeks within 21 days. 1, 8
• Skin elasticity demonstrates significant improvement in 75% of studies, representing the second-strongest outcome parameter. 8
• Skin surface spots and pore size show statistically significant improvement at 3-month follow-up (p=0.01 and p=0.03 respectively). 2
• Patient satisfaction scores improve significantly across all FACE-Q domains: facial appearance (p=0.025), skin quality (p=0.002), cheeks (p=0.001), lower face/jawline (p=0.002), and lips (p=0.04). 2

Comparative Effectiveness

• Liquid PRF demonstrates marginal superiority over PRP for canthal region treatment at 3 months, though differences are modest. 1
• PRF shows 3-fold higher therapeutic response compared to PRP when combined with microneedling for skin rejuvenation. 1
• Combination with microneedling or radiofrequency significantly enhances outcomes compared to liquid PRF monotherapy. 1, 7

Safety Profile and Contraindications

Safety Considerations

• No major adverse events have been reported in clinical studies—liquid PRF is extremely well-tolerated with minimal downtime. 1, 2
• Risk of vascular occlusion is lower with liquid PRF compared to cross-linked fillers, though practitioners should remain alert for blanching, severe pain, or skin mottling. 6
• For patients on anticoagulant medication, extend centrifugation time to 18-20 minutes to ensure adequate clot formation. 1

Patient Selection

• Age does not significantly affect liquid PRF effectiveness—improvements in skin density and thickness are consistent across patients aged 30-60 years. 9
• Gender shows no significant impact on liquid PRF clotting times or clinical outcomes. 5

Combination Therapy Strategies

Synergistic Approaches

• Combining liquid PRF with microneedling produces synergistic effects, with significantly better outcomes than either modality alone for skin texture, wrinkles, and pore reduction. 1
• Radiofrequency combined with liquid PRF offers safe and effective treatment with more favorable results than RF alone for neck laxity and facial rejuvenation. 7
• Liquid PRF can be mixed with hyaluronic acid fillers for enhanced facial volumization and skin quality improvement, though this remains an emerging application. 1

Cost-Effectiveness and Practical Considerations

• Liquid PRF preparation is simple, requires minimal instrumentation, and represents a cost-effective autologous treatment option. 1, 10
• The procedure is accessible and unbiased, making it suitable for diverse patient populations seeking facial rejuvenation. 1
• Preparation time is approximately 10-15 minutes from blood draw to injection-ready product. 10, 4