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September 1995, Vol 149, No. 9 >
Article | September 1995

Explanation for False-positive Urine Cultures Obtained by Bag Technique FREE

William Lane M. Robson, MD, FRCPC, MRCP(Glasg), FRSH; Alexander K. C. Leung, MBBS, FRCP(Edin), FRCPC
Arch Pediatr Adolesc Med. 1995;149(9):1042. doi:10.1001/archpedi.1995.02170220107023.
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The well-designed study by Schlager et al1 in the February issue of the Archives demonstrated that the periurethral area was colonized with a potential urinary pathogen in 20 (20%) of 98 newborns. The periurethral area was colonized only in female and uncircumcised male newborns; none of the circumcised male newborns had positive periurethral swab cultures. Whenever the periurethral area was colonized, a urine specimen obtained by bag technique grew the same bacteria.1

Some readers might infer from this study that a bag urine specimen is unreliable for the diagnosis of urinary tract infection (UTI). What Schlager et al2 have shown is that when the clinical suspicion of UTI is low—such as in the newborn period, when the symptoms of UTI are often nonspecific—a bag specimen has a high rate of false-positive results. When the clinical suspicion of UTI is low, a suprapubic aspiration or in-and-out catheter might

REFERENCES

1 +
Schlager TA, Hendley JO, Dudley SM, Hayden GF, Lohr JA.  Explanation for false-positive urine cultures obtained by bag technique . Arch Pediatr Adolesc Med . 1995;;149:170-173.
2 +
Lidefelt K-J, Bollgren I, Nord CE.  Changes in periurethral microflora after antimicrobial drugs . Arch Dis Child . 1991;;66:683-685.
3 +
WinbergJ, Bollgren I, Gothefors L, Herthelius M, Tullus K.  The prepuce: a mistake of nature? Lancet . 1989;;1:598-599.

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Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

References

1 +
Schlager TA, Hendley JO, Dudley SM, Hayden GF, Lohr JA.  Explanation for false-positive urine cultures obtained by bag technique . Arch Pediatr Adolesc Med . 1995;;149:170-173.
2 +
Lidefelt K-J, Bollgren I, Nord CE.  Changes in periurethral microflora after antimicrobial drugs . Arch Dis Child . 1991;;66:683-685.
3 +
WinbergJ, Bollgren I, Gothefors L, Herthelius M, Tullus K.  The prepuce: a mistake of nature? Lancet . 1989;;1:598-599.

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