PRP Injection: A 5-Step Process From Blood Draw to Recovery

What a PRP Injection Is

PRP injection is a regenerative procedure that draws a small volume of the patient's own blood, processes it in a centrifuge to isolate and concentrate platelets, and then reintroduces that concentrated plasma directly into an injured or inflamed tissue site. The goal is to flood the target area with growth factors the body already produces, accelerating the natural repair sequence. Because the source is the patient's own blood, rejection risk is essentially eliminated. The process is completed within a single clinic visit, typically under 90 minutes from check-in to discharge.

Steps 1 and 2: Blood Draw and Centrifuge Processing

A standard PRP draw at Rebuild Regen collects between 20 mL and 60 mL of whole blood from a peripheral vein, usually in the arm. The sample goes immediately into the centrifuge. Centrifugation separates the blood into its components by density: red blood cells settle at the bottom, buffy coat in the middle, and platelet-rich plasma rises to the top.

The resulting PRP concentrate contains a platelet count several times higher than baseline whole blood. Platelet concentration matters because platelets are the primary delivery mechanism for growth factors including PDGF, TGF-beta, VEGF, and EGF. These proteins signal local cells to proliferate and repair. A dilute concentrate produces a dilute response.

Steps 3 and 4: Injection Site Preparation and Delivery

The target site is cleaned and, depending on location and patient preference, a topical or local anesthetic is applied. PRP injections into tendons, ligaments, and joint spaces are typically performed without imaging guidance for surface-level sites; deeper structures such as the hip or knee may use ultrasound guidance for precision.

The injection itself takes seconds. Patients commonly describe a pressure sensation and mild ache at the site, not sharp pain. The volume injected depends on the target tissue: a knee joint may receive 3 to 5 mL; a tendon attachment point like the plantar fascia typically receives 1 to 2 mL.

After injection, the treated area is dressed, and the patient rests briefly at the clinic before discharge.

Step 5: Recovery and What to Expect

PRP therapy triggers an intentional inflammatory response. Soreness, mild swelling, and stiffness at the injection site are expected for 24 to 72 hours post-procedure. NSAIDs such as ibuprofen should be avoided for at least two weeks after PRP, as anti-inflammatory drugs suppress the platelet activity the procedure depends on. Patients are encouraged to keep the area mobile but avoid high-impact loading for the first week.

Functional improvement in tendon and joint conditions is typically observed between four and eight weeks, with continued progress through three to six months. Some conditions require a series of injections. Your PRP therapy consultation at Rebuild Regen includes a clear protocol outline before any treatment begins.

Is PRP the Right Approach for Your Condition?

PRP is well-supported for tendinopathy, ligament injuries, early-to-moderate osteoarthritis, and hair restoration. For patients with more significant structural damage or systemic inflammatory conditions, PRP may be a starting point or one component of a broader protocol. Our complete guide to PRP therapy covers candidacy and expected timelines in full.

How Many PRP Sessions Are Usually Needed?

Most orthopedic applications involve one to three sessions spaced four to six weeks apart. Chronic conditions or larger joint involvement sometimes require additional sessions based on clinical response.

Is PRP Different From Stem Cell Therapy?

PRP concentrates the patient's own platelets and growth factors from their own blood. Stem cell therapy introduces allogeneic mesenchymal stem cells. PRP is autologous; stem cell therapy uses donor-derived cells. Some protocols combine both.

Can PRP Be Combined With Other Treatments?

PRP pairs clinically with shockwave therapy, laser therapy, and biologic injections. Elizabeth Celestin, APRN, FNP-C, reviews each patient's goals and designs protocols accordingly.

When PRP Is Not Indicated

Active infection at the injection site, platelet dysfunction disorders, anticoagulant therapy that cannot be paused, and very low platelet counts are contraindications. Severe structural damage such as full-thickness tendon rupture or end-stage joint destruction typically requires surgical evaluation rather than PRP alone.