Also mention amount of anticoagulant and activator calcium chloride to be used
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PRP platelet rich plasma preparation anticoagulant sodium citrate calcium chloride activator amounts protocol
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anticoagulant amount sodium citrate calcium chloride activator PRP preparation
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calcium chloride concentration volume ratio to activate PRP platelet rich plasma
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PRP preparation sodium citrate 3.2% 1:9 ratio blood collection calcium chloride 10% 50ul per ml activation protocol
Here is a comprehensive overview of PRP preparation covering the anticoagulant and calcium chloride activator amounts:
PRP Preparation: Anticoagulant & Calcium Chloride Activator
Step 1 — Blood Collection with Anticoagulant
The anticoagulant is added to the collection tube before blood draw to prevent premature platelet activation.
| Anticoagulant | Concentration | Ratio to Blood | Notes |
|---|---|---|---|
| Trisodium Citrate (most common) | 3.2% or 3.8% | 1:9 (1 part anticoagulant : 9 parts blood) | Standard for platelet studies; 3.2% preferred for PRP |
| ACD-A (Acid Citrate Dextrose) | Standard formulation | 1:6 to 1:9 (typically 1 mL ACD-A per 6 mL blood) | Considered superior — better platelet morphology, higher TGF-β1 and PDGF-BB concentrations |
| EDTA | — | — | Avoid — dissociates GPIIb/IIIa complex, damages platelet membrane |
| Heparin | — | — | Less preferred; can cause platelet aggregation artefacts |
Practical example: For a 27 mL blood draw (a common PRP protocol), use 3 mL of ACD-A or sodium citrate → yields ~3–5 mL of PRP after centrifugation.
Step 2 — Centrifugation
- Single spin: ~1,500 rpm (280–400×g) for 7–10 min (separates RBCs from platelet-rich supernatant)
- Double spin: First at ~160×g (1,300 rpm/10 min), then ~400×g (2,000 rpm/10 min) for higher platelet concentration
- Optimal temperature: 12–16°C for best platelet recovery
Step 3 — Activation with Calcium Chloride
Calcium chloride restores free Ca²⁺ ions (chelated by citrate), triggering the coagulation cascade and growth factor release from alpha granules.
| Parameter | Details |
|---|---|
| Concentration used | 10% CaCl₂ is most commonly cited in literature |
| Volume ratio | 50 µL (0.05 mL) of 10% CaCl₂ per 1 mL of PRP |
| Alternative concentrations | 2.5% CaCl₂ — associated with better cell proliferation and fibroblast adhesion; 5% CaCl₂ — intermediate effect; 10% CaCl₂ — rapid activation but may cause pain (low pH ~6.3) |
| Physiological protocol (Anitua) | Less anticoagulant (0.4 mL of 3.8% sodium citrate) + 20 µL/mL activator |
| Conventional protocol (Anitua) | More anticoagulant (0.9 mL of 3.8% sodium citrate) + 50 µL/mL activator |
After adding CaCl₂, the PRP is incubated at 37°C and clot formation begins within 15 minutes. Growth factor release (PDGF, TGF-β, VEGF) occurs progressively from 15 min to 24 hours.
Alternative Activators (for comparison)
| Activator | Dose | Characteristics |
|---|---|---|
| Bovine/autologous thrombin | 10% solution | Immediate growth factor release; risk of immune reaction with bovine thrombin |
| Calcium chloride + thrombin | Combined | Rapid + sustained GF release |
| Collagen type I | 10% | Sustained release; reduces overall GF concentration |
| No activation (endogenous) | — | Adequate for soft tissue injection (collagen in tissue acts as natural activator) |
Key Clinical Notes
- 2.5% CaCl₂ produces better fibroblast morphology and cell proliferation — preferred for dermatology/aesthetics
- 10% CaCl₂ produces rapid activation and dense fibrin — preferred for orthopedic/surgical applications
- When using ACD-A as anticoagulant, the CaCl₂ dose must be sufficient to overcome the higher citrate binding capacity
- A 30 mL blood draw yields approximately 3–5 mL PRP depending on baseline platelet count and technique
Sources: Henry's Clinical Diagnosis and Management by Laboratory Methods; Frontiers in Cell and Developmental Biology (2020); JCAS Review on PRP Preparation Principles
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