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Determination of specificity and sensitivity of anti-RA 33 in diagnosis of early rheumatoid arthritis.
Global Journal of Health Science 2014 May 29
BACKGROUND: Rheumatoid arthritis is a chronic inflammatory disease with uncertain etiology characterized by symmetric polyarthritis in peripheral joints. Its diagnosis is based on clinical findings and serologic tests. They are rarely conclusive in early course of the disease. So, its early diagnosis could be difficult. The present study was designed to evaluate the role of Anti -RA33; an Auto-Antibody against RA33 in early diagnosis of the disease.
MATERIALS & METHODS: forty three patients who had been visited in a Rheumatology Clinic were randomly selected. Their disease has been diagnosed by a Rheumatologist. 55 persons were chosen from healthy individuals who had attended in other clinic. Their age and sex were matched with the case group. Anti-RA33 and RF titers were measured in their blood sample using standard methods.
FINDINGS: RF and Anti-RA33 titers had significant correlation in case group (p=0.015). Anti -RA33 test had 98% sensitivity, 20% specificity, 55% positive predictive value, and 90% negative predictive.
CONCLUSION: Anti -RA33 could have diagnostic and prognostic value in diagnosis and evaluation of patients with RA, and its differentiation from other small joint disorders, particularly when the other serologic tests are negative.
MATERIALS & METHODS: forty three patients who had been visited in a Rheumatology Clinic were randomly selected. Their disease has been diagnosed by a Rheumatologist. 55 persons were chosen from healthy individuals who had attended in other clinic. Their age and sex were matched with the case group. Anti-RA33 and RF titers were measured in their blood sample using standard methods.
FINDINGS: RF and Anti-RA33 titers had significant correlation in case group (p=0.015). Anti -RA33 test had 98% sensitivity, 20% specificity, 55% positive predictive value, and 90% negative predictive.
CONCLUSION: Anti -RA33 could have diagnostic and prognostic value in diagnosis and evaluation of patients with RA, and its differentiation from other small joint disorders, particularly when the other serologic tests are negative.
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