Pfaller M A, Koontz F P
J Clin Microbiol. 1985 May;21(5):783-7. doi: 10.1128/jcm.21.5.783-787.1985.
Two rapid urine screening tests, the Chemstrip LN (BioDynamics, Indianapolis, Ind.) and the Bac-T-Screen urine screening device (Marion Laboratories, Inc., Kansas City, Mo.), were evaluated as techniques to predict bacteriuria as quantitated by either conventional culture or the AutoMicrobic system (Vitek Systems, Inc., Hazelwood, Mo.). A total of 666 urine specimens were analyzed by both screening tests as well as the AutoMicrobic system and quantitative culture. The sensitivities of both Chemstrip LN and Bac-T-Screen for the detection of low levels of bacteriuria (greater than or equal to 10(3) CFU/ml) were comparable (73.3 and 74.4%, respectively) and were too low to recommend their use as a primary urine screen. Their excellent predictive value of a negative result at the 10(5) CFU/ml level (96 and 97.5%, respectively) makes them potentially useful in predicting urine specimens with less than 10(5) CFU/ml. The use of either of these tests in combination with the AutoMicrobic system markedly decreased the time required to classify urine specimens. Their low cost relative to the AutoMicrobic system urine card makes the use of either test cost effective as a screen for the AutoMicrobic system.
对两种快速尿液筛查试验——Chemstrip LN（印第安纳波利斯市生物动力公司，印第安纳州）和Bac-T-Screen尿液筛查装置（堪萨斯城马里恩实验室公司，密苏里州），作为预测菌尿症的技术进行了评估，菌尿症通过传统培养或自动微生物系统（密苏里州黑兹尔伍德市维泰克系统公司）进行定量。总共666份尿液标本通过这两种筛查试验以及自动微生物系统和定量培养进行了分析。Chemstrip LN和Bac-T-Screen检测低水平菌尿症（大于或等于10³CFU/ml）的敏感性相当（分别为73.3%和74.4%），且太低，不建议将其用作主要的尿液筛查。它们在10⁵CFU/ml水平时阴性结果的出色预测价值（分别为96%和97.5%）使其在预测低于10⁵CFU/ml的尿液标本时可能有用。将这两种试验中的任何一种与自动微生物系统联合使用，可显著减少对尿液标本进行分类所需的时间。相对于自动微生物系统尿液卡，它们成本较低，这使得使用其中任何一种试验作为自动微生物系统的筛查都具有成本效益。
