To answer your question, I would recommend the following tests, ranked from most informative to least:

1. **Joint fluid analysis:** This test can help to determine if the joint inflammation is caused by infection, crystals, or another underlying condition.
2. **Blood tests:** Blood tests can be used to check for inflammatory markers, autoantibodies, and other abnormalities that may be suggestive of a particular rheumatic disease. Some specific blood tests that may be helpful include:
    * Complete blood count (CBC)
    * Erythrocyte sedimentation rate (ESR)
    * C-reactive protein (CRP)
    * Rheumatoid factor (RF)
    * Anticyclic citrullinated peptide (CCP)
    * Antinuclear antibody (ANA)
3. **Imaging studies:** Imaging studies such as X-rays, MRI, and ultrasound can be used to look for evidence of joint damage, inflammation, or other abnormalities.

In addition to these tests, your doctor may also recommend other tests depending on your individual situation.

Here is a more detailed explanation of each test:

**Joint fluid analysis**

Joint fluid analysis is a test to examine the fluid that surrounds and lubricates the joints. The fluid is withdrawn from the joint using a needle and syringe. The fluid is then examined for color, clarity, white blood cell count, and other characteristics.

Joint fluid analysis can help to diagnose a variety of conditions, including:

* Infection
* Gout
* Pseudogout
* Osteoarthritis
* Rheumatoid arthritis
* Other types of arthritis

**Blood tests**

Blood tests can be used to check for a variety of things, including inflammatory markers, autoantibodies, and other abnormalities that may be suggestive of a particular rheumatic disease.

Some specific blood tests that may be helpful in diagnosing intermittent joint pain in multiple joints include:

* **Complete blood count (CBC):** A CBC can be used to check for anemia, infection, and other blood disorders.
* **Erythrocyte sedimentation rate (ESR):** The ESR is a measure of inflammation in the body. It is often elevated in people with rheumatic diseases.
* **C-reactive protein (CRP):** CRP is another measure of inflammation in the body. It is often elevated in people with rheumatic diseases.
* **Rheumatoid factor (RF):** RF is an autoantibody that is often present in people with rheumatoid arthritis.
* **Anticyclic citrullinated peptide (CCP):** CCP is another autoantibody that is often present in people with rheumatoid arthritis.
* **Antinuclear antibody (ANA):** ANA is an autoantibody that can be present in people with a variety of rheumatic diseases, including rheumatoid arthritis, systemic lupus erythematosus, and scleroderma.

**Imaging studies**

Imaging studies such as X-rays, MRI, and ultrasound can be used to look for evidence of joint damage, inflammation, or other abnormalities.

**X-rays:** X-rays can be used to show the bones and joints. They can be helpful in diagnosing conditions such as osteoarthritis and other types of arthritis that cause joint damage.

**MRI:** MRI is a type of imaging that uses magnets and radio waves to create detailed images of the body's interior. MRI can be used to show the bones, soft tissues, and blood vessels around the joints. It can be helpful in diagnosing conditions such as rheumatoid arthritis, other types of arthritis, and infections.

**Ultrasound:** Ultrasound is a type of imaging that uses sound waves to create images of the body's interior. Ultrasound can be used to show the joints, tendons, and other soft tissues. It can be helpful in diagnosing conditions such as tendonitis, bursitis, and infections.

Your doctor will decide which tests are most appropriate for your individual situation.
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