# Why isn't platelet-rich plasma (PRP) made the same way each time? *Why Blood Treatment Can Vary | Biologic Injections Tempe* > What is an orthobiologic procedure? It uses blood or body tissue for joint care. This biologic injections Tempe guide explains platelet-rich plasma (PRP). Your joint may loosen after breakfast. By afternoon, it can ache again. That change can make any new treatment sound tempting. Platelet-rich plasma, called PRP, comes from your blood. A machine spins the blood and saves a platelet-rich part. Platelets, the small pieces in blood, help it clot. Relief isn't certain, but easing soreness is the hope. ## What is an orthobiologic procedure made from? Orthobiologics are joint treatments that use blood or body tissue. PRP is the blood-based kind described above. Other choices may use marrow or fat. The material isn't prepared the same way. Blood holds platelets, red cells, and white cells. Spinning separates those blood parts. The doctor keeps the part needed for PRP. The letters alone won't tell you its makeup. Marrow and fat aren't forms of PRP. Each needs its own collection process. Each also has different costs and research. More collection work doesn't prove more relief. ## Why can the blood mixture change? Machines can save different shares of each blood part. Some PRP keeps more white cells. Less liquid may contain a larger platelet share. The amount used in treatment isn't fixed. Those differences may change soreness just after treatment. Research hasn't found one best blood mixture. More platelets don't always mean more relief. There's no proof fewer white cells work better either. Ask which blood parts the clinic measures. Ask how much platelet-rich liquid is used. You don't need every lab term. You'll need a clear description instead. ## What helps while I decide about blood-based care? Keep up easy motion that feels safe. Build strength if your doctor agrees. Don't work through a sharp ache. Your joint won't settle well after too much use. Write down when soreness starts. Note swelling, lost sleep, and stiff motion. Take any X-ray report you already have. You won't have to recall every detail. Ask how much relief is reasonable. Ask when you might notice it. Evidence isn't clear, mainly outside the knee. QC Kinetix medical providers, meaning trained clinicians, can explain how concentrated PRP is prepared from your blood. ## Sources 1. Blood from seven donors was processed through five commercial PRP systems (Arthrex Angel, Emcyte Genesis CS, Arteriocyte Magellan, Harvest SmartPrep, Biomet GPS III). White-cell concentration ranged from 11.0 to 27.3 thousand/uL between systems, neutrophil concentration from 0.6 to 9.4 thousand/uL, red-cell concentration from under 1.1 to 3.2 million/uL, and pH from 6.95 to over 7.26. The authors advise caution in interpreting clinical PRP results because the product itself differs by device. Degen RM, et al. — [Commercial Separation Systems Designed for Preparation of Platelet-Rich Plasma Yield Differences in Cellular Composition.](https://pubmed.ncbi.nlm.nih.gov/28167878/). *HSS Journal*, 2017. DOI: 10.1007/s11420-016-9519-3. 2. A single-donor comparison of five PRP preparations (RegenPRP, Mini GPS III, Selphyl, Arthrex ACP and a laboratory protocol) across ten donors found two systems produced leukocyte-RICH PRP with higher red-cell, white-cell and neutrophil proportions while three produced leukocyte-poor PRP, and that platelet and growth-factor doses varied substantially between devices, with platelet dose positively correlated with every growth factor measured. Magalon J, et al. — [Characterization and comparison of 5 platelet-rich plasma preparations in a single-donor model.](https://pubmed.ncbi.nlm.nih.gov/24725317/). *Arthroscopy*, 2014. DOI: 10.1016/j.arthro.2014.02.020. 3. A double-blind randomized trial allocated 192 patients with KL 1-3 knee OA to three weekly injections of leukocyte-RICH or leukocyte-POOR PRP (mean leukocyte concentration 7,991 x10^6/L vs 0.1 x10^6/L). No difference was found in any clinical score at 2, 6 or 12 months (IKDC improved 45.6 to 60.7 vs 46.8 to 62.9; P=.626). Mild adverse events were numerically more frequent with leukocyte-rich PRP (12.2% vs 4.7%) but not significantly so. Di Martino A, et al. — [Leukocyte-Rich versus Leukocyte-Poor Platelet-Rich Plasma for the Treatment of Knee Osteoarthritis: A Double-Blind Randomized Trial.](https://pubmed.ncbi.nlm.nih.gov/35103547/). *American Journal of Sports Medicine*, 2022. DOI: 10.1177/03635465211064303. 4. A systematic review of 32 studies comparing leukocyte-poor and leukocyte-rich PRP in knee OA found both formulations improved pain and function above the MCID with no significant difference between them at 3, 6 or 12 months - but leukocyte-RICH PRP carried significantly higher odds of post-injection pain (OR 1.64; 95% CI 1.29-2.10) and swelling (OR 1.56; 95% CI 1.22-1.99). Kim JH, et al. — [Adverse Reactions and Clinical Outcomes for Leukocyte-Poor Versus Leukocyte-Rich Platelet-Rich Plasma in Knee Osteoarthritis: A Systematic Review and Meta-analysis.](https://pubmed.ncbi.nlm.nih.gov/34277879/). *Orthopaedic Journal of Sports Medicine*, 2021. DOI: 10.1177/23259671211011948. 5. A 2026 network meta-analysis of 21 RCTs (2,254 patients) found both leukocyte-rich and leukocyte-poor PRP significantly superior to placebo and to hyaluronic acid for function at 6-12 months (MD vs placebo -13.20 and -10.54 respectively). LP-PRP ranked highest (P-score 0.96) but the DIRECT comparison between the two formulations showed no statistically significant difference, and the authors concluded there is insufficient evidence to recommend one PRP formulation over the other. Xu B, et al. — [Leukocyte-rich versus leukocyte-poor platelet-rich plasma and hyaluronic acid for knee osteoarthritis: a systematic review and network meta-analysis.](https://pubmed.ncbi.nlm.nih.gov/41629990/). *Journal of Orthopaedic Surgery and Research*, 2026. DOI: 10.1186/s13018-026-06689-4. 6. A 2026 systematic review of leukocyte-rich versus leukocyte-poor PRP for osteoarthritis concluded the current evidence is insufficient to determine whether adding leukocytes provides any clinical benefit, that results generally show no significant difference between the two, and that there is no conclusive evidence local reactions are caused by leukocytes specifically. Martin-Vega M, et al. — [Leukocyte-rich versus leukocyte-poor platelet-rich plasma for Osteoarthritis: A systematic review.](https://pubmed.ncbi.nlm.nih.gov/41782804/). *Regenerative Therapy*, 2026. DOI: 10.1016/j.reth.2026.101078. 7. A meta-analysis with meta-regression of 10 Level I-II studies (696 patients) of PRP augmentation during rotator cuff repair classified trials by whether the platelet concentration factor exceeded a 4-fold increase over whole blood. Neither patient-reported outcomes nor retear rates differed between high-dose and low-dose PRP - a direct test of the 'more platelets is better' premise, which it did not support in this setting. Lim JJ, et al. — [Platelet Concentration Does Not Influence Clinical Efficacy and Retear Rates of Rotator Cuff Repair With Platelet-Rich Plasma: A Systematic Review and Meta-analysis With Meta-Regression.](https://pubmed.ncbi.nlm.nih.gov/41947497/). *American Journal of Sports Medicine*, 2026. DOI: 10.1177/03635465261434001. ## What can I ask at QC Kinetix? Bring notes on when your soreness starts. Add what calms it and what brings it back. QC Kinetix medical providers, meaning trained clinicians, can check how your joint moves and describe non-surgical regenerative treatments using blood or body tissue. Book a free consultation: --- Ease the soreness. Choose your next step. Straight answers on joint soreness, care using blood or body tissue, warning signs, and the nearest QC Kinetix clinic. Direct answers about sore joints, safe steps, urgent symptoms, and nearby choices. This site is operated by the owners of the QC Kinetix Phoenix-area clinics, including the Chandler location discussed here, and those owners benefit when readers book with their clinics. © 2026 Tempe Biologic Brief. General education only, not medical advice or a diagnosis; discuss your own history with a qualified clinician.