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Rheumatoid Factor (RF) Blood Test

Original price £55.00 - Original price £55.00
Original price
£55.00 - £55.00
Current price £55.00

A test to detect the presence of antibodies produced by the immune system that can attack healthy tissues, commonly associated with rheumatoid arthritis and other autoimmune disorders.

  • Biomarkers: 1
  • Turnaround: 1-2 days

Simple and accurate blood test from a laboratory you can speak to.

Step 1. Choose sample collection option

Currently selected option: HOME KIT via Royal Mail Tracked 24

  • Available everywhere in mainland UK.
  • Includes everything you need to take a safe and suitable blood sample in about 15 minutes.
  • Post the sample back to our laboratory via Royal Mail Tracked 24.

Re-test guarantee

About the Rheumatoid Factor Blood Test

Rheumatoid arthritis is a long-term autoimmune condition affecting millions globally. It leads to pain, swelling, and deterioration of the joints, hindering individuals from carrying out everyday tasks. While there is no definitive cure for RA, early detection and intervention can control symptoms and minimise further joint degradation.

The rheumatoid factor biomarker test serves as one method for facilitating RA diagnosis. The Rheumatoid Factor (RF) test is a blood analysis that quantifies the presence of RF antibodies in your bloodstream. These antibodies are generated by the immune system when it mistakenly targets healthy body tissues, such as your joints. Elevated levels of these antibodies can signal RA or other autoimmune conditions.

However, it is crucial to understand that not everyone with RA will have high RF antibody levels, and conversely, some without RA may have elevated levels. As such, while the RF test is a valuable diagnostic aid, it is most effective when used alongside clinical assessments.

1 Biomarker


    - Rheumatoid Factor (RF)


    Need more biomarkers? Check out our Aches and Pains Blood Test.

Stay ahead of joint and autoimmune issues with our Rheumatoid Factor (RF) Blood Test. Our user-friendly home test kits offer quick results, usually within 24 hours, from our CQC-accredited UK lab. With results clearly presented along with expert commentary on our secure online Health Dashboard, our comprehensive service equips you with the crucial insights you need. You will be empowered to make better-informed decisions about your health and take preventative action.

Choose One Day Tests to proactively manage your joint health without the need for referrals or waiting lists. Order an RF Blood Test kit today and take the first step towards a healthier you.


    For most biomarkers our usual turnaround time is 24-48 hours, or less, from the time your sample is in our lab. We do not wait for all the results to complete before sending them to you, so you may start receiving results the same day for most cases, or as results become available.

    We are extremely proud of our very short turnaround times and a very efficient laboratory processes. Whilst we accommodate the shortest of time scales, with some results available within hours, for this particular test the usual turnaround time is:

    1-2 days

Doctor's notes

Hi, I am Dr. Adam Staten and here's my view on this test as a GP and Clinical Director at One Day Tests.

If you are experiencing joint pain, swelling, stiffness, and fatigue, it's a good idea to address these symptoms of RA or other autoimmune disorders.

The RF test can be a helpful tool in diagnosing RA, but it's not definitive. Other factors, such as your symptoms, medical history, physical examination are all important in making a diagnosis.

Additionally, a negative RF test does not necessarily rule out RA, as some patients with RA do not have high levels of RF antibodies.

Red flag symptoms for the Rheumatoid Factor (RF) Blood Test

If you experience any of the following symptoms, it is crucial to consult your physician immediately. Even if your RF levels are within the normal range, these symptoms could indicate an underlying autoimmune or joint-related condition that requires further medical evaluation:

  • Persistent joint pain or stiffness, especially in the hands, wrists, or knees
  • Swelling or warmth around the joints
  • Morning stiffness lasting longer than 30 minutes
  • Unexplained fatigue or weakness
  • Fever accompanied by joint pain
  • Numbness or tingling in the extremities
  • Reduced range of motion in affected joints
  • Skin redness or rashes near joints

These symptoms warrant immediate attention, as they could be indicative of rheumatoid arthritis or other autoimmune disorders.

Your Results and Health Dashboard

The results of your Rheumatoid Factor (RF) Blood Test will be emailed to you as a secured PDF file, ready for your GP and will also be uploaded to our Health Dashboard area of the website. It’s a unique and powerful tool, powered by our in-house clinical analysis research, to match your biomarkers across test panels and symptoms, as well as provide clinical commentary on all individual biomarkers you tested for.

The health dashboard will also provide "panel level" commentary - a birds eye view of the biomarkers that were tested. This feature allows you to view your test results and clinical commentary, and compare them to previous results, giving you a clear understanding of how your health is progressing.

By using the Health Dashboard, you can identify changes in your biomarkers and make necessary adjustments to your lifestyle. This added value is immense, as it empowers you to monitor your health and make informed decisions about your well-being.

It's free and is available with all of our tests.

Save on continuous monitoring with our subscription plan

The best way to look after your health is to do so regularly. This is easy to do with our continual monitoring plans which give you a discount on future blood tests. You choose the frequency and we'll do the rest.

When you purchase a subscription, we will deliver your home test kits or allow you to book appointments in line with your chosen frequency. You will be able to track your biomarkers over time in our powerful Health Dashboard, where results will be automatically updated for you. There is a minimum of 3 tests with any subscription, after which you can pause/restart/cancel at any time.

Special instructions

Hi, I am Stefania Brown, I am the Laboratory Manager at One Day Tests and here are the lab's special requests for the Rheumatoid Factor (RF) Blood Test.

There are no special instructions for preparing for the RF test.

Venepuncture appointment - how to prepare

If you are coming into one of our clinics for the test, this is what you need to do before you arrive:

  • Drink plenty of water about an hour before the appointment.
  • Avoid coffee/tea/energy drinks. Water is good!
  • That’s it! We’ll do the rest.

Home test kit for Rheumatoid Factor (RF) Blood Test - how it works

Our blood test kits are simple and convenient.

The most important step in doing a blood test at home is to read the instructions very carefully. The process is very simple, but there are a few pitfalls you need to be aware of - you will save yourself a lot of time if you do it right the first time around!

  • Full printed instructions will arrive with your kit - please read them carefully.
  • Drink plenty before taking the sample and warm your hands up in the sink with warm water for a few minutes. This will make your blood flow much better.
  • Fill the tubes to the top line. We don’t need much blood; filling tubes to the top line is about 15 drops of blood.
  • Post the samples on the same day you take them, before midday, Monday to Thursday. If you post it any other time it might get to us late or be stuck at a sorting office over the weekend. You will then have to do it again.
  • Package the sample in the same box the kit came in. Otherwise, Royal Mail or DPD will reject it. The sample tubes go into a pouch, then into a cardboard box, and then into a return envelope. All of this is provided in the kit: please use it.

We look forward to receiving your sample in our lab!

How the finger prick home test kit for Rheumatoid Factor (RF) Blood Test works - from Dr. Adam Staten

Why choose us?

Hello! My name is Dr. Vinesh Mistry, I am part of the GP team here at One Day Tests and here is why you should trust us to test your blood.

We run our own regulated laboratories and our own accredited clinics. We manufacture our own approved home sample collection kits. Your results are looked after by our fantastic clinical governance team and our super-talented biomedical science team.

When you book your test with us - you book directly with the lab. This means accuracy and responsible duty of care, direct access to the provider and extremely fast turnaround times.

Finally, our customer services rock! You can ask the lab a question any time or you can speak to a real human. It's good to WhatsApp, email on or give us a call on 0845 527 07 67.

Frequently Asked Questions

Hi, I am Lana Nela, Lead Nurse, and here is what we are frequently asked about this test.

What can cause elevated RF levels?

Elevated RF levels can be due to various factors such as autoimmune diseases like rheumatoid arthritis, lupus, or Sjogren`s syndrome. Infections and certain chronic diseases can also result in elevated RF levels.

What should I do if my RF levels are high but I have no symptoms?

Elevated RF levels without symptoms could still be a sign of an underlying issue. It is essential to consult a healthcare provider for a comprehensive evaluation, which may include additional tests and imaging studies.

Can I take this test if I am already on medication for rheumatoid arthritis?

Yes, you can take the test while on medication, but it is essential to inform us as medications can influence the test results.

Why take this test?

Hi, I am Dr. Marco Esposito and here is why it's important to take this test.
  • If you are experiencing symptoms like persistent joint pain, swelling, or stiffness, the RF Blood Test can offer crucial insights into your condition
  • If you are concerned about the long-term effects of certain medications on your immune system, this test can serve as a useful indicator
  • For those with a family history of autoimmune diseases or rheumatoid arthritis, regular RF testing can be a proactive measure to catch potential issues early, enabling more effective intervention and management
  • An RF test is often included as part of a broader autoimmune or arthritis panel, providing a comprehensive view of your immune system's health

Is this test right for you?

Hi, I am Sandeep Patel, I am the Laboratory Director at One Day Tests. Here are the symptoms that you may wish to address with this test.

Given the immune system's critical role in defending the body against infections and diseases, the Rheumatoid Factor Blood Test is essential for assessing immune health and identifying early signs of autoimmune disorders or inflammatory conditions.

For individuals who experience persistent joint pain, swelling, or stiffness, this test serves as a valuable tool for monitoring your immune system`s condition and understanding the impact of these symptoms on your overall health.

By taking the Rheumatoid Factor Blood Test, you are taking a proactive step towards comprehensive immune health, allowing you to make informed decisions that can significantly impact your well-being.


    Aches, Arthritis, Bones, Joint pain, and Joint swelling

Why blood tests are important.