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Rheumatoid Factor (RF) Blood Test

Original price £39.00 - Original price £39.00
Original price
£39.00 - £39.00
Current price £39.00


Sample collection is included in the price of the test, from your arm at our clinics or via a home finger prick kit.

Results - same or next day for most markers, with Health Dashboard explanations.

Quick and simple, from a local lab you can speak to.

Please choose sample collection option:

Currently selected option: Home kit

This option is included in the price. Your blood sample kit will be delivered via Royal Mail Tracked 24. 

You will receive your home sample collection kit, with everything you need to take a safe and suitable blood sample, together with detailed instructions on how to do it. The whole procedure takes about 15 minutes. 

You can then return the sample to us via Royal Mail Tracked 24.

Retest guarantee - our home kits work extremely well. However, if anything goes wrong or we need more blood - we will send you another kit absolutely free, so you can order with confidence.

Check out our full explanation on how the home kits work.

About the Rheumatoid Factor Blood Test

Rheumatoid arthritis is a chronic autoimmune disorder that affects millions of people worldwide. It causes pain, inflammation, and joint damage, making it difficult for people to perform their daily activities. Although there is no cure for RA, early diagnosis and treatment can help manage the symptoms and prevent further joint damage. One way to aid in the diagnosis of RA is through the use of the rheumatoid factor biomarker test.

The rheumatoid factor (RF) test is a blood test that measures the level of RF antibodies in your blood. RF antibodies are produced by the immune system when it attacks healthy tissues in the body, such as the joints. High levels of RF antibodies in the blood can be an indication of RA or other autoimmune disorders. However, it's important to note that not all patients with RA have high levels of RF antibodies, and some patients without RA can have high levels of RF antibodies. Therefore, the RF test, while being an excellent indicator towards a problem, is just one tool used in the diagnosis of RA, and it should be used in conjunction with clinical evaluations.

1 Biomarker


    - Rheumatoid Factor (RF)


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


    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, you should allow up to 48 hours for you results to come back for routine testing and potentially longer for specialised investigations.

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

Even if your blood tests are normal, you should see a doctor if you have any of the symptoms below.

  • Red, hot and swollen joints
  • Joint pains and fever
  • You are losing weight or feeling generally unwell with your joint pains

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.

Can a high level of RF antibodies in my blood mean I have something other than RA?

Yes, high levels of RF antibodies can also be indicative of other autoimmune disorders, such as lupus or Sjogren's syndrome.

Why take this test?

Hi, I am Dr. Marco Esposito and here is why it's important to take this test.

The RF test can aid in the early diagnosis of RA and other autoimmune disorders. Early detection can help prevent further joint damage and improve patient outcomes. Additionally, the RF test can help monitor disease activity and the effectiveness of treatment.

Is this test right for you?

Hi, I am Jehad Al-Nashash, I am the Laboratory Director. Here are the symptoms that you may wish to address with this test.

If you are experiencing joint pain, swelling, stiffness, and fatigue, you should talk to your GP about the possibility of RA or other autoimmune disorders.

The RF test can be a helpful tool in the diagnosis and management of these conditions.


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

Why blood tests are important.