The erythrocyte sedimentation test is a laboratory procedure which may be of some help in diagnosing rheumatic fever and is known to be of definite aid in evaluating the clinical conditions of patients with this disease. During the acute and subacute or active phases of rheumatic fever it is common practice to obtain sedimentation values rather frequently to help in following the course of the disease. The most important use of the sedimentation values is as an aid in determining when the disease passes from the active to the inactive phase. After the infection has subsided, the physical activity of the patient can be increased safely. Clinically there is little need for taking frequent readings until the patient's general condition is such that there is a real question as to whether the disease is active or inactive. After the infection has subsided and the disease is inactive, it is common
MCKINLEY JB, JACKSON RL. COMPARISON OF WESTERGREN AND KATO ERYTHROCYTE SEDIMENTATION RATE READINGS: RELATION TO THE CLINICAL STATUS OF CHILDREN WITH RHEUMATIC FEVER. Am J Dis Child. 1944;67(6):474–479. doi:10.1001/archpedi.1944.02020060047008
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