anco de Sangre Ouiz Casos clinicos Examen 2 1. Of the following agents, which on

Question

anco de Sangre Ouiz Casos clinicos Examen 2 1. Of the following agents, which one is not known to be the cause of rouleaux? a. Dextran b. Fibrinogen c. Albumin d. PVP A technologist inadvertenly uses too high a concentyration of saline suspended cells in a grouping test. What kind of error may occur as a result of using such cells? 2. A prozone phenomenon with a false negative result due to antibody excess b. a. A prozone phenomenon with a false positive result due to antigen excess A postzone phenomenon with a false negative result due to antibody excess c. d. A postzone phenomenon with a false negative result due to antigen excess Of the following the one characteristic shared between blood of chimeras and Ax individuals is: 3. a. The in utero exchange of erythropoietic tissue with fraternal twins b. That both are inherited c. That both are due to the suppressed expression of the A antigen d. The mixed field agglutination reaction they show on testing with appropriate sera The discrepancy between serum and cell grouping of cord blood contaminated with Wharton's jelly is due to: 4. Hyaluronic acid, which coats or alter the red cells a. b. Hyaluronidase, which causes ar eduction in the zeta potential with subsequent non specific agglutination c. Trypan blue, which is often a contaminant of cord blood d. Colloidal silica, which is a frequent contaminant of cord blood

Explanation / Answer

Ans. 1 Rouleaux formation is retarded by albumin proteins. The acute phase proteins specially fibrongen play main role in increasing rouleaux formation.dextran as well as PVP are also agent for rbc aggregation.

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