How to Prepare PRF: A Step-by-Step Centrifugation Protocol Guide

Introduction

PRF preparation is time-sensitive by design. Because a PRF tube contains no anticoagulant, blood begins to clot the moment it enters the tube — and the quality of the fibrin matrix depends on how quickly and consistently the tube is centrifuged after the draw. Unlike PRP preparation, where anticoagulated blood can wait, PRF rewards a disciplined, repeatable workflow.

This guide walks through the end-to-end PRF preparation sequence — from the materials checklist to layer recovery — with the centrifugation parameters most commonly cited for standard PRF, A-PRF / A-PRF+ and i-PRF, plus the errors that most often compromise results.

1. Preparation Checklist

• Additive-free PRF tubes — correct size for the protocol, within labelled expiry
• Low-speed centrifuge — capable of the protocol speed, with rotor holders sized for 10-15ml tubes
• Collection equipment — appropriate venous access per your facility protocol
• Timer — PRF timing is measured in minutes; do not rely on memory
• Sterile work surface and recovery instruments — for transferring or pressing the matrix

Confirm the tube fits the rotor before you start: PRF tubes are sized for standard 10-15ml blood collection tube holders. See our centrifuge collection for low-speed desktop models commonly paired with PRF tubes.

2. Step-by-Step PRF Preparation

Step 1: Draw blood directly into the PRF tube

Draw the required volume — typically 10ml, 12ml or 15ml — directly into the additive-free tube. Because clotting starts immediately, the next step should follow without delay.

Step 2: Centrifuge at the protocol speed

Spin the tube once, at low speed, per the protocol family you are preparing. Do not centrifuge twice — PRF is a single-spin preparation by design.

PRF family	Typical speed	Typical time	Result
Standard PRF	~2,700 rpm	~12 minutes	Dense fibrin plug
A-PRF / A-PRF+	~1,300-1,500 rpm	8-14 minutes	Soft, cell-rich matrix
i-PRF	~700 rpm	~3 minutes	Liquid preparation

These parameters are those most commonly cited in published protocols. Because rotor radius affects the actual g-force delivered at a given rpm, verify settings against your specific centrifuge model and tube lot.

Step 3: Separate the layers

After the spin, three fractions are visible in the tube: red blood cells at the bottom, the fibrin matrix in the middle, and platelet-poor plasma at the top. Use sterile instruments to remove the matrix.

Step 4: Use or process the matrix

The matrix can be used directly, transferred, or processed further — for example, gently pressed into a membrane using a sterile press. Work within the preparation's usable window; do not let it dry out before use.

3. Common Errors That Compromise PRF

• Delaying centrifugation after the draw — the single most common cause of inconsistent matrices. Clotting is already underway; spin promptly.
• Using the wrong speed — a protocol stated in rpm assumes a specific rotor. Confirm the delivered g-force matches the protocol you follow.
• Using expired or improperly stored tubes — check the EXP date and store boxes at room temperature, away from sunlight and moisture.
• Double-spinning — PRF is a single-spin preparation; a second spin is not part of PRF protocols.
• Undocumented settings — inconsistent results are almost always traceable to undocumented protocol drift between sessions.

4. Documentation: The Consistency Tool

Record the following for every protocol you run: tube size and lot, centrifuge model and rotor, speed (rpm and g-force if available), time, brake setting, and time between draw and spin. A documented protocol turns PRF from a technique into a reproducible procedure — and makes troubleshooting possible when results drift. For guidance on which tube to pair with each workflow, see what PRF tubes are and the comparison of i-PRF vs A-PRF vs A-PRF+.

Frequently Asked Questions

How soon after blood draw must PRF be centrifuged?

Promptly. Because the tube contains no anticoagulant, clotting begins immediately after the draw, so minimize the delay between draw and centrifugation for consistent results.

Can PRF be prepared with a double spin?

No. PRF is a single-spin preparation by design — the fibrin matrix forms during one low-speed centrifugation. Double-spin protocols belong to PRP preparation, not PRF.

Does the centrifuge need to be refrigerated or heated?

No. Standard room-temperature operation is typical. The critical variables are speed, time, and the delay between draw and spin.

What happens if I centrifuge PRF too fast?

Higher speeds push more cells toward the red-cell layer and produce a denser, less cell-rich matrix than the protocol intends — the preparation drifts toward standard-PRF characteristics even if you intended A-PRF or i-PRF.

What tubes should I use for PRF preparation?

Additive-free PRF tubes within their labelled expiry, sized for your centrifuge rotor. VivaPRP PET PRF tubes are available in 10ml, 12ml and 15ml — browse the PRF tube collection.

Disclaimer: This article is educational content only and not medical advice. Protocol parameters are as commonly cited in published literature and vary by equipment and tube lot — always verify settings against your centrifuge and follow applicable regulations and clinical judgment.

VivaPRP manufactures CE-marked PRF tubes under ISO 13485, plus low-speed desktop centrifuges sized for 10-15ml tubes. For specifications or wholesale and OEM enquiries, contact our team.