Rheumatoid arthritis. The ESR or CRP may also be normal in patients newly presenting with rheumatoid arthritis. In a large study of RA patients from Finland and US, between 45-47% of patients had a normal ESR, 44-58% had normal CRP at presentation. BOTH were normal in 33% and 42% of patients**.When a rheumatoid factor test was included, 14-15% of patients had no abnormalities in all 3 tests.t is also well described that inflammation can be visible in the joints using MRI ultrasound scans in patients with known rheumatoid arthritis in the absence of inflammation clinically or on blood tests.
http://www.ronankavanagh.ie/blog/arthritis-with-normal-blood-tests-why-not/
Most commonly, rheumatoid factor is used as a blood test for the diagnosis of rheumatoid arthritis. Rheumatoid factor is present in about 80% of adults (but a much lower proportion of children) with rheumatoid arthritis. In people with rheumatoid arthritis, high levels of rheumatoid factor can indicate a tendency toward more aggressive disease and/or a tendency to develop rheumatoid nodules and/or rheumatoid lung disease.
http://www.medicinenet.com/rheumatoid_factor/article.htm
Rheumatoid Factor (RF). Rheumatoid factor (RF) is part of the immune system’s overactive response. It shows up in the blood of about 70% to 80% of people with RA. High levels of it are linked to more severe cases. Drawbacks: It misses 20% to 30% of cases of RA.t’s usually higher than normal in people with RA and other inflammatory diseases. Doctors may use this test to see whether treatment has lowered inflammation. Drawbacks: The test doesn’t diagnose RA or any other disease. It also doesn’t show why someone has inflammation.
http://www.webmd.com/rheumatoid-arthritis/arthritis-test-results
Rheumatoid factor (RF) facts. 1  Rheumatoid factor is an antibody that is detectable in the blood of approximately 80% of adults with rheumatoid arthritis.2  Sometimes rheumatoid factor can be detected in the blood of normal individuals and of those with other autoimmune diseases that are not rheumatoid arthritis. In people with rheumatoid arthritis, high levels of rheumatoid factor can indicate a tendency toward more aggressive disease and/or a tendency to develop rheumatoid nodules and/or rheumatoid lung disease.
http://www.medicinenet.com/rheumatoid_factor/article.htm
About 20% of those with confirmed RA will not have an abnormal RF test, while 5% of people who do not have RA will have an abnormal RF test. Negative levels do not exclude the disease, and positive levels do not guarantee the diagnosis. The normal range of RF is from 0-20 u/ml.heumatoid arthritis (RA) is a chronic autoimmune disease that primarily affects the joints, but can affect other parts of the body. Diagnosing and managing RA involves clinical evaluation by a rheumatologist, as well as several different laboratory tests that require blood work.
https://www.hss.edu/conditions_understanding-rheumatoid-arthritis-lab-tests-results.asp
ESR is calculated by measuring the rate at which red blood cells sediment in a test tube in one hour Normal levels for men range from 0-15 mm/hr to 0-20mm/hr and for women 0-20 mm/hr/ to 0-30mm/hr, depending on age-higher for people over the age of 50).heumatoid arthritis (RA) is a chronic autoimmune disease that primarily affects the joints, but can affect other parts of the body. Diagnosing and managing RA involves clinical evaluation by a rheumatologist, as well as several different laboratory tests that require blood work.
https://www.hss.edu/conditions_understanding-rheumatoid-arthritis-lab-tests-results.asp
This blood test also measures levels of general inflammation in the body but on a ... children with juvenile rheumatoid arthritis, no significant abnormality will be found in these blood tests. ... But these drugs can interfere with normal growth and increase susceptibility to infection, so ... normal range for platelets is 150,000 to 450,000 platelets per microliter of blood. If your blood count is above 450,000, your doctor will likely look for an underlying condition. ... Your doctor may also: Check the level of iron in your blood; Test for markers of inflammation; ...
http://www.lifescript.com/health/centers/rheumatoid_arthritis/z.aspx?query=normal%20blood%20test%20ranges%20%26%20Rheumatoid%20Arthritis
Rheumatoid arthritis (RA) is a chronic autoimmune disease that primarily affects the joints, but can affect other parts of the body. Diagnosing and managing RA involves clinical evaluation by a rheumatologist, as well as several different laboratory tests that require blood work.heumatoid arthritis (RA) is a chronic autoimmune disease that primarily affects the joints, but can affect other parts of the body. Diagnosing and managing RA involves clinical evaluation by a rheumatologist, as well as several different laboratory tests that require blood work.
https://www.hss.edu/conditions_understanding-rheumatoid-arthritis-lab-tests-results.asp
Interpretation. Rheumatoid factor (RF) is used in the diagnosis of rheumatoid arthritis (RA). RF results are positive in approximately 75% of patients with RA, although RF is not etiologically related to RA.High RF titers indicate a poorer prognosis, as patients with higher RF levels tend to have more severe disease.Fs are used as a marker in individuals with suspected rheumatoid arthritis (RA) or other autoimmune conditions. The normal reference range for RF is less than 15 IU/mL or less than 1:16.
http://emedicine.medscape.com/article/2087091-overview
A cyclic citrullinated peptide (CCP) antibody test may be ordered along with or following a rheumatoid factor (RF) test to help diagnose rheumatoid arthritis (RA) and to assess the severity and probable course of the disease (prognosis). cyclic citrullinated peptide (CCP) antibody test may be ordered along with or following a rheumatoid factor (RF) test to help diagnose rheumatoid arthritis (RA) and to assess the severity and probable course of the disease (prognosis).
https://labtestsonline.org/understanding/analytes/ccp/tab/test
rheumatoid arthritis blood test normal range
The normal range of blood test for  rheumatoid arthritis 0-20 units per millilitre. The normal range for the rheumatoid arthritis blood test is 0 to 20 units per milliliter.