Evaluation of Chemstrip LN® in a Male Geriatric Population

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Abstract
A dipstick method of bacteriologic screening of urine using a combination of leukocyte esterase and nitrite indicators, Chemstrip LN, was evaluated in a male inpatient geriatric population. Three hundred seventy-five urine samples from 198 symptomatic patients (age range, 45 to 98 years; mean, 69.6) were tested by LN and cultured using standard methods. LN showed 169 negatives, but in 7 of these cases, the culture was positive (.gtoreq. 5 .times. 104 col/mL). Organisms recovered from these cultures were Candida (not albicans), Group B Streptococcus, Staphylococcus aureus, and in four cases, Pseudomonas aeruginosa. In the four cases of missed Pseudomonas the patients were receiving aminoglycoside therapy for 2 to 6 days and/or drugs that dye the urine. Despite the fact that many patients were on medications known to interfere with the test strips, the negative predictive value was still 96.0% showing that the strips may be suitable for use with this population given the understanding that certain antibiotics and/or substances that dye the urine may give false negative results.

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