Reference value for RF is typically:

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Multiple Choice

Reference value for RF is typically:

Explanation:
RF is an autoantibody directed against IgG. In healthy individuals, RF is usually not present or appears at only trace levels, so the reference value is negative or very low. This baseline negative level helps labs distinguish normal from abnormal results. A positive or elevated RF can occur in autoimmune diseases like rheumatoid arthritis and Sjögren’s, but it can also appear with infections, aging, or other conditions, so it’s interpreted in the clinical context rather than alone.

RF is an autoantibody directed against IgG. In healthy individuals, RF is usually not present or appears at only trace levels, so the reference value is negative or very low. This baseline negative level helps labs distinguish normal from abnormal results. A positive or elevated RF can occur in autoimmune diseases like rheumatoid arthritis and Sjögren’s, but it can also appear with infections, aging, or other conditions, so it’s interpreted in the clinical context rather than alone.

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