drawing blood cultures after antibiotics

The presence of blood in the CSF can affect cultures since antibiotics in blood can inhibit bacterial growth. H Blood 13 mL is considered adequate for a child and.

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If more than one tube is being collected the first tube may contain contaminated blood from lumbar puncture and should not be the tube sent to the microbiology laboratory.

. Since a major consequence of contaminated cultures is a lower positive predictive value PPV for the blood culture test and the pretest probability of bacteremia is a key determinant of PPV there have been increasing endeavors to discourage the utilization of blood cultures in patients at very low risk for this disease. For example clinical bacteremia prediction rules have been.

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