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Home All Specialties Emergency

24 hours may be sufficient to monitor blood cultures in febrile infants

byJames Jiang
July 22, 2014
in Emergency, Infectious Disease, Pediatrics
Reading Time: 2 mins read
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1. The mean time to blood culture positivity in febrile infants with bacteremia was roughly 15 hours. 

2. By 24 hours, 91% of blood cultures had already become positive. By 48 hours, 99% of blood cultures had become positive. 

Evidence Rating Level: 2 (Good) 

Study Rundown: Febrile infants often receive blood cultures routinely as part of their evaluation. These infants are often hospitalized for 48 hours or longer, receiving antibiotics while their blood culture results are pending. There is no standardized time interval of observation that has been recommended. This study demonstrated that most pathogens in febrile infants are identified on a blood culture within 24 hours, suggesting that hospitalization longer than 24 hours may be unnecessary.

Strengths of the study include a large number of hospitals that were included in the study, including a wide geographical area covering all major regions of the United States. Study limitations include the extensive exclusion criteria, which excluded a vast majority of positive blood cultures, including those from patients in intensive care units and patients who have had surgery. The time between blood culture collection and placement into the automated detection system was not considered in this study. Moreover, due to the cross sectional design of the study, patients were not followed up and their outcomes are not stated in the study.

Click to read the study in JAMA Pediatrics

Relevant Reading:  Time to positivity of neonatal blood cultures: fast and furious?

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In-Depth [cross sectional study]: This multicenter, retrospective, cross sectional study examined the blood culture results of febrile (>38.0 degrees C) infants 90 days old or younger, obtained from 17 hospital systems in the United States. Blood cultures were excluded if the infants were in an intensive care unit, had a surgical history, or if the organism was not treated as pathogenic. A total of 392 blood cultures were included in the study.

The mean time to positivity (TTP) was 15.41 hours (SD = 8.30). It was noted that TTP was shorter in cultures drawn from infants 30 days and younger as compared to infants 61 to 90 days old.. By 24 hours, 91% of cultures were positive. 96% and 99% of cultures were positive at 36 and 48 hours, respectively. E Coli species were the most prevalent (41%), followed by Group B streptococcal species (22%), viridans streptococci (8%), S aureus (6%), and Streptococcus pneumonia (5%). The TTP was not significantly different for different sexes. When common contaminating organisms were excluded, the TTP was not significantly affected.

Image: PD 

©2012-2014 2minutemedicine.com. All rights reserved. No works may be reproduced without expressed written consent from 2minutemedicine.com. Disclaimer: We present factual information directly from peer reviewed medical journals. No post should be construed as medical advice and is not intended as such by the authors, editors, staff or by 2minutemedicine.com. PLEASE SEE A HEALTHCARE PROVIDER IN YOUR AREA IF YOU SEEK MEDICAL ADVICE OF ANY SORT.  

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