What doctor treats osteoarthritis? Who to see, how it is diagnosed, and what X-rays and blood tests can show
Osteoarthritis care usually starts with your GP or primary care doctor. Who else may help, how it is diagnosed, and what X-rays and blood tests can show.
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Your knee aches on the stairs or your fingers are stiff in the morning, and you wonder who to see. Usually you start with your GP or primary care doctor; an orthopedic specialist or a rheumatologist may come in later, depending on what they find. X-ray reports, letters and lab results can go in a folder or into Sam's Health Vault, which, once you consent, reads values such as CRP and uric acid from a lab report.
This guide covers the path to a diagnosis. It explains who does what, what the exam involves, when an X-ray is used and what blood tests can and cannot show. What to log between appointments is in the osteoarthritis pain diary guide. What Sam keeps for this condition is on the osteoarthritis page.
What kind of doctor treats osteoarthritis?
Start with your GP or primary care doctor. A GP will first ask about your symptoms and examine your joints, says the NHS. Arthritis UK, the charity formerly called Versus Arthritis, adds that a GP can usually diagnose osteoarthritis from what you tell them. You will not normally need further tests or a specialist unless there is some doubt about the cause.
Care for osteoarthritis is often a team effort, says NIAMS, the US National Institute of Arthritis and Musculoskeletal and Skin Diseases. Its list includes these roles:
| Who | What they do |
|---|---|
| GP or primary care doctor | First visit, examination, referrals; coordinates care and other health problems |
| Physical therapist (physiotherapist) | Helps improve joint function |
| Orthopedic surgeon | Treatment and surgery for bone and joint diseases |
| Rheumatologist | Arthritis and other diseases of the bones, joints and muscles |
| Physiatrist | Physical medicine and rehabilitation; supervises exercise |
| Occupational therapist | Joint protection, pain management and everyday tasks |
Which of them you need, and when, is for you and your doctor to work out.
Should you see an orthopedist or a rheumatologist?
Neither ranks above the other. They do different jobs. NIAMS describes orthopedic surgeons as specialists in treatment and surgery for bone and joint diseases. Rheumatologists specialize in arthritis and other diseases of the bones, joints and muscles.
The NHS describes two cases where a GP refers you to a rheumatologist. One is when the GP thinks you have rheumatoid arthritis. The other is when tests for gout remain unclear. One cue for your doctor is stiffness: the NHS notes that prolonged morning stiffness can be a sign of rheumatoid arthritis. That is a cue for your doctor, not a test to run at home. What to note about stiffness is in the pain diary guide. Two inflammatory types are compared in gout or rheumatoid arthritis.
How is osteoarthritis diagnosed?
There is no single test, says NIAMS. The diagnosis rests on your history and an examination:
- History: your symptoms, other medical problems in your close family, and your medicines.
- Examination: your general health, your reflexes and the affected joints.
- Tests only where needed: X-rays, MRI, blood tests or a sample of joint fluid.
During the exam, Arthritis UK says the doctor looks for:
- tenderness over the joint
- creaking or grating
- bony swelling
- excess fluid
- stiffness or restricted movement
- joint instability
- weak or thinning muscles around the joint
The NHS names three cues that make a GP suspect osteoarthritis. You are 45 or older. Joint pain gets worse the more you use the joint. Morning stiffness is absent or lasts less than 30 minutes. These are cues for your doctor, not a test to run at home. Even if all three fit, only your doctor can diagnose osteoarthritis; if one does not fit, that is not an all-clear either. Data from a phone or watch is not part of this assessment; what Apple Watch walking data shows is in Apple Watch and osteoarthritis.
When is an X-ray needed, and what does the report say?
Often it is not. The NHS says X-rays and blood tests are not usually necessary for osteoarthritis. They may be used to rule out other causes, such as rheumatoid arthritis or a broken bone. NIAMS adds that early joint damage does not usually show on X-rays.
If you do have one, MedlinePlus lists typical findings such as loss of joint space, bone spurs and subchondral cysts. Your report may use these terms:
- Loss of joint space: the gap between the bones has narrowed.
- Bone spurs, also called osteophytes.
- Subchondral cysts: bony changes near the joint.
- Subchondral sclerosis: denser bone just beneath the cartilage.
Some reports add a Kellgren-Lawrence grade. A review in Clinical Orthopaedics and Related Research calls it widely used in practice and research. It also notes that the wording for each grade varies between sources:
| Grade | What the X-ray shows |
|---|---|
| 0 | No narrowing, no changes |
| 1 | Doubtful narrowing, possible small spurs |
| 2 | Definite spurs, possible narrowing |
| 3 | Moderate spurs, definite narrowing, some sclerosis |
| 4 | Large spurs, marked narrowing, severe sclerosis, deformed bone ends |
The grade says little about your pain. A review of knee studies found that pain and X-ray changes overlap only loosely. Among people with knee pain, 15 to 76 percent had osteoarthritis on X-ray. Among people with X-ray changes, 15 to 81 percent reported knee pain. Why symptoms guide care is covered in the pain diary guide.
MRI shows soft tissue. Generally, NIAMS says, it helps with a joint that locks or gives way.
Is there a blood test for osteoarthritis?
No. Blood tests are not helpful in diagnosing osteoarthritis, says MedlinePlus, the US National Library of Medicine's health site. They can be used to look for other conditions, such as rheumatoid arthritis or gout. These are tests your report may show:
| Test | What your doctor may use it for |
|---|---|
| ESR and CRP | Signs of inflammation in the body |
| Rheumatoid factor | Rheumatoid arthritis |
| Anti-CCP | Rheumatoid arthritis |
| Uric acid | Gout |
No single result settles it. No blood test can definitively prove or rule out rheumatoid arthritis, the NHS says. For gout, a GP may measure uric acid. If the result is unclear, a specialist may take fluid from the joint with a thin needle. NIAMS lists joint fluid sampling to check for causes such as infection or gout. So a normal-looking result is not an all-clear, and an abnormal one is not proof.
In Sam's Health Vault, about 33 lab values are matched by name, including CRP and uric acid. Rheumatoid factor, anti-CCP and ESR are not among them. Sam keeps those rows under the name your lab printed. Where a range is printed, Sam shows it next to the value, with High, Low or In range; that is only a comparison with your lab's range. If your lab prints separate ranges for women and men, Sam keeps only the first one; the original report shows which range applies to you. That can include uric acid. Some values end up under the wrong name, so the original report always comes first. What the values mean is for your doctor to discuss with you.
How do you get a specialist appointment?
In the UK, your GP refers you when a specialist is needed. For physiotherapy, many areas let you go straight to NHS community musculoskeletal (MSK) services without a GP referral, the NHS says. The GP or a first contact physiotherapist may refer you on if needed. There may be a long waiting list, the NHS adds.
In the US, it depends on your plan. Many HMOs require a referral from your primary care doctor before you see anyone else, says HealthCare.gov. Without one, the plan may not pay. Check your plan before you book.
If symptoms get worse while you wait, or new ones appear, contact your doctor sooner. For the signs in the next section, do not wait at all.
Which signs mean you should not wait?
Book a GP or primary care appointment if joint pain stops you doing normal activities or disturbs your sleep. The same goes if pain or swelling is getting worse or keeps coming back. It also applies if your joints are stiff for more than 30 minutes after waking. That is how the NHS puts it.
Get urgent help from a doctor or an urgent-care service for:
- Sudden severe pain and swelling in one joint.
- A red or hot joint.
- Joint pain with a fever, chills or feeling generally unwell.
In the UK that means an urgent GP appointment or NHS 111. In an emergency call your local emergency number (112 in the EU, 999 in the UK, 911 in the US).
Go to the emergency department straight away, or call your local emergency number, for:
- Very bad joint pain after a fall or injury.
- A joint that has moved out of place.
- Tingling or numbness around an injured joint.
- Not being able to walk or put weight on a joint.
Do not wait for it to pass.
What should you bring to your first appointment?
- Earlier reports: X-ray or MRI reports, lab results, letters.
- Your referral, if you have one.
- A list of everything you take, including over-the-counter products.
- Your notes: which joints, since when, how bad, how long you are stiff in the morning.
- Your questions.
Questions you could ask: What is the diagnosis based on? Do I need an X-ray, and why? Which blood tests were done, and what were they meant to rule out? When should I come back, and which signs mean sooner? A fuller list is in the doctor appointment checklist.
In Sam, reports and letters go into the Health Vault as a photo or PDF. Between your last two lab reports, Sam shows up to three values with the biggest change. Values that appear in only one report, or are printed in different units, are not compared. What you take goes into the medication list; its catalog is a selection, not a recommendation, so check the strength on your pack. What belongs on that list is covered in medication list for your doctor. Joint pain, morning stiffness and swelling go into the symptom diary per day, as mild, moderate or severe.
Keep your reports in Sam for the specialist visit
You arrive with your reports in one app instead of hunting through folders and photos.
- Instead of a folder: photograph your X-ray report, letters and lab results, or upload them as PDF.
- Instead of retyping: once you consent, Sam reads values such as CRP and uric acid from a lab report, and you check them before saving.
- Instead of flipping pages: for your last two lab reports, Sam shows the three biggest changes.
- Instead of memory: you log joint pain and morning stiffness in the symptom diary, per day.
Sam gives no finding on X-rays or blood results. High, Low or In range only compares a value with your lab's printed range; with separate ranges for women and men, Sam keeps only the first. The original report is what counts. More on the osteoarthritis page.
Try Sam for freeSam is a wellness companion, not a medical device. The app does not diagnose, treat, cure or prevent any disease or health condition. Always consult qualified professionals for medical decisions.
Related reading
- Osteoarthritis pain diary: what to write down
- Gout or rheumatoid arthritis? Key differences
- Apple Watch and osteoarthritis: what walking data shows
- Doctor appointment checklist for a chronic condition
- Medication list for your doctor: what to include
Sources
Updated: October 2026
- NIAMS (US National Institutes of Health): Osteoarthritis: diagnosis, treatment, and steps to take (last reviewed September 2023)
- NHS: Osteoarthritis (reviewed 20 March 2023), Rheumatoid arthritis: diagnosis (reviewed 8 March 2023), Gout (reviewed 24 August 2023), Physiotherapy (reviewed 3 April 2025), Joint pain (reviewed 26 February 2026) and Septic arthritis (reviewed 3 September 2026)
- Arthritis UK (formerly Versus Arthritis): Osteoarthritis (reviewed July 2026)
- MedlinePlus (US National Library of Medicine): Osteoarthritis (reviewed 9 April 2026)
- Kohn MD, Sassoon AA, Fernando ND: Classifications in Brief: Kellgren-Lawrence Classification of Osteoarthritis. Clin Orthop Relat Res 2016;474:1886-1893
- Bedson J, Croft PR: The discordance between clinical and radiographic knee osteoarthritis: a systematic search and summary of the literature. BMC Musculoskelet Disord 2008;9:116
- HealthCare.gov: Referral (glossary)
- Weston V, Coakley G: Guideline for the management of the hot swollen joint in adults with a particular focus on septic arthritis. J Antimicrob Chemother 2006;58:492-493
More on Osteoarthritis
Frequently Asked Questions
What kind of doctor treats osteoarthritis?+
Usually your GP or primary care doctor first. Arthritis UK says a GP can usually make the diagnosis from what you tell them and an examination. Others may join later: a physiotherapist for joint function, an orthopedic surgeon for treatment and surgery of bones and joints, or a rheumatologist if an inflammatory type of arthritis is suspected. NIAMS, part of the US National Institutes of Health, also lists physiatrists and occupational therapists.
How is osteoarthritis diagnosed?+
There is no single test, says NIAMS. Your doctor asks about your symptoms, your medicines and your family's health, then examines you. Arthritis UK says the doctor looks for signs such as tenderness, creaking, bony swelling, excess fluid and restricted movement. X-rays, MRI, blood tests or a joint fluid sample are used when there is doubt or another cause needs ruling out.
Is there a blood test for osteoarthritis?+
No. MedlinePlus, the US National Library of Medicine's health site, says blood tests are not helpful in diagnosing osteoarthritis. Doctors use them to look for other conditions, such as rheumatoid arthritis or gout. Typical tests are ESR and CRP for inflammation, rheumatoid factor and anti-CCP for rheumatoid arthritis, and uric acid for gout. A normal-looking result is not an all-clear, and an abnormal one is not proof.
Should I see an orthopedist or a rheumatologist for osteoarthritis?+
It depends on what your doctor suspects; one does not rank above the other. Orthopedic surgeons specialize in treatment and surgery for bone and joint diseases. Rheumatologists specialize in arthritis and other diseases of the bones, joints and muscles. In the UK, a GP who thinks you have rheumatoid arthritis refers you to a rheumatologist. Your doctor can help you decide.
Do I need an X-ray or MRI to be diagnosed with osteoarthritis?+
That is for your doctor to decide. The NHS says X-rays and blood tests are not usually necessary for osteoarthritis, but may rule out other causes such as rheumatoid arthritis or a broken bone. NIAMS notes that early joint damage often does not show on X-rays and that MRI mainly helps with a joint that locks or gives way.
What does Kellgren-Lawrence grade 2 mean on my X-ray report?+
The Kellgren-Lawrence scale grades X-ray changes from 0 to 4. Grade 2 describes definite bone spurs (osteophytes) and a joint space that may be narrowed. The grade says little about how much pain you have. What it means for you is for your doctor to explain.
Which signs mean I should not wait for a specialist appointment?+
Sudden severe pain and swelling in one joint, a red or hot joint, or joint pain with a fever, chills or feeling generally unwell should be checked urgently by a doctor or an urgent-care service. In the UK that means an urgent GP appointment or NHS 111. In an emergency call your local emergency number (112 in the EU, 999 in the UK, 911 in the US). Very bad joint pain after a fall or injury, a joint that has moved out of place, tingling or numbness around an injured joint, or not being able to walk or put weight on a joint: go to the emergency department straight away or call your local emergency number.