Erythrocyte sedimentation rate (ESR) is dependent upon_______________?
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Answer: D. All of the above
Explanation
Erythrocyte sedimentation rate depends upon plasma viscosity, fibrinogen levels, and rouleaux formation. All these physiological factors combine to influence how quickly red blood cells settle. Option D is correct because every listed factor affects the sedimentation rate. ESR is a non-specific laboratory blood test used to monitor systemic inflammation. Inflammatory proteins like fibrinogen alter the surface charge of red blood cells. Stacked red blood cells form rouleaux aggregates that settle faster in vertical tubes.
Clinicians use ESR results to help diagnose and monitor conditions like temporal arteritis. Elevated sedimentation rates indicate active inflammatory processes occurring somewhere in the body. Technical variations in blood collection and temperature can influence ESR test results. Viscidity or plasma viscosity contributes directly to red blood cell settling behavior. Fibrinogen bridges red blood cells together, promoting rapid rouleaux formation and high ESR. Rouleaux formation increases the effective mass of sedimenting cells in the test tube.
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