| erythrocyte protoporphyrin t. |
EP t.; a screening test for lead toxicity, in which erythrocyte protoporphyrin levels are determined by direct fluorometry of whole blood or fluorescence analysis of whole blood extracts; levels are increased in lead poisoning and iron deficiency.
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| erythropoietin independence |
A characteristic of red blood cell colonies in polycythemia rubra vera. Normal red blood cell progenitors do not multiply without stimulation by erythropoietin; cells from patients with polycythemia vera can replicate
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| erythrocyte s. |
the sedimentation of erythrocytes in a volume of drawn blood; see erythrocyte sedimentation rate, under rate.
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| erythropsin |
A term formerly used to indicate rhodopsin, or visual purple. SYN: rhodopsin.
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| erythrocyte sedimentation r. |
the rate at which erythrocytes precipitate out from a well-mixed specimen of venous blood, measured by the distance the top of the column of erythrocytes falls in a given time interval under specified conditions; an increase in rate is usually due to elevated levels of plasma proteins, especially fibrinogen and immunoglobulins, which decrease the zeta potential on erythrocytes by dielectric shielding and thus promote rouleau formation. It is increased in monoclonal gammopathy, hypergammaglobulinemia due to inflammatory disease, hyperfibrinogenemia, active inflammatory disease, and anemia. The traditional methods of calculating ESR are the Westergren method and the Wintrobe method. See also zeta sedimentation ratio under ratio.
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