Sharose PP Some strains produce fibrinolysin, dis-solve the clot after 4 hours of incubation at 35°C, and may appear to be negative if allowed to incubate longer than 4 hours. Because citrate-utilizing organisms may yield false-positive results, plasma containing ethylenediamine-tetraacetic acid (EDTA) rather than citrate should be used.
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Cell At Work brought me here
In coagulase test which is clump bacteria or plasma??
Plasma from EDTA
citrate gives false positive reaction
Sharose PP Some strains produce fibrinolysin, dis-solve the clot after 4 hours of incubation at 35°C, and may appear to be negative if allowed to incubate longer than 4 hours. Because citrate-utilizing organisms may yield false-positive results, plasma containing ethylenediamine-tetraacetic acid (EDTA) rather than citrate should be used.
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I finally understand it. Thanks
Thank you!