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Related Experiment Videos

An evaluation of two rapid bacteriuria screening procedures.

S G McNeeley, V S Baselski, G M Ryan

    Obstetrics and Gynecology
    |April 1, 1987
    PubMed
    Summary

    Two rapid bacteriuria screening tests were evaluated. Bac-T-Screen showed higher sensitivity than Chemstrip LN, but its high false-positive rate and cost limit its clinical utility for detecting significant bacteriuria.

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    Area of Science:

    • Clinical microbiology
    • Diagnostic test evaluation
    • Urology

    Background:

    • Urinary tract infections (UTIs) are common, especially in women.
    • Rapid screening tests aim to quickly detect significant bacteriuria (≥10^4 CFU/mL).
    • Accurate and cost-effective screening is crucial for timely diagnosis and treatment.

    Purpose of the Study:

    • To evaluate the diagnostic performance of two rapid bacteriuria screening tests: Chemstrip LN and Bac-T-Screen.
    • To compare their sensitivity, specificity, and predictive values in obstetric and non-pregnant female populations.

    Main Methods:

    • Prospective evaluation of Chemstrip LN and Bac-T-Screen against urine culture.
    • Inclusion of 694 obstetric patients and 143 non-pregnant females with suspected UTIs.

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  • Calculation of sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV).

    • Main Results:

    • Chemstrip LN demonstrated low sensitivity (69.6% in obstetric, 71.9% in non-pregnant) and inadequate performance for routine screening.
    • Bac-T-Screen exhibited higher sensitivity (96.4% in obstetric, 84.4% in non-pregnant) but lower specificity (56.0% in obstetric, 65.8% in non-pregnant).
    • Bac-T-Screen had a high false-positive rate, particularly in non-pregnant women, and a high cost per test.

    Conclusions:

    • Chemstrip LN is not suitable for routine screening due to insufficient sensitivity.
    • Bac-T-Screen offers improved sensitivity but its high false-positive rate and cost may limit its application, especially when urine culture is feasible and cost-effective.
    • Further research may be needed to optimize rapid screening methods for bacteriuria.