Leukocyte esterase activity and nitrite test as a rapid screen for significant bacteriuria

Area of Science:

• Clinical chemistry
• Microbiology
• Diagnostic testing

Background:

• Urinary tract infections (UTIs) are common and require accurate laboratory diagnosis.
• Traditional urine cultures are effective but can be time-consuming and costly.
• Rapid diagnostic methods are needed to improve efficiency in clinical laboratories.

Purpose of the Study:

• To evaluate the diagnostic accuracy of a reagent strip test for detecting leukocyte esterase and nitrite in urine specimens.
• To compare the performance of the reagent strip test against semiquantitative urine cultures.
• To assess the potential of the reagent strip test in reducing laboratory testing costs.

Main Methods:

• A total of 252 urine specimens were analyzed.
• A reagent strip test (Chemstrip L/N) was used to detect leukocyte esterase and nitrite.
• Results were compared with semiquantitative urine cultures.

Main Results:

• The reagent strip test demonstrated high accuracy in identifying negative results.
• All urine specimens with less than 10(5) CFU/mL (colony-forming units per milliliter) were correctly predicted as negative by the reagent strip test.
• The test showed potential for efficient screening of urine samples.

Conclusions:

• The Chemstrip L/N reagent strip test is a reliable method for ruling out urinary tract infections when results are negative.
• Implementing this screening test can help reduce the number of urine cultures performed, leading to significant cost savings.
• This approach can improve laboratory workflow and resource allocation for urinalysis.