Only urine nitrite showed a high specificity. In clinical practice, such false-positive results could lead to false-positive UTI diagnosis. No urinalysis index was positively correlated with culture contamination.Ĭontemporary automated urinalysis indices were often abnormal in a disease-free population of women, even using ideal collection technique. "ideal" technique, respectively, were: leukocyte esterase (>trace) 50%, 35% (95% confidence interval for difference -6% to 36%) nitrites (any) 2.5%, 2.5% (difference -2.5 to 2.5%) white blood cells (>5/high-powered field ) 50%, 27.5% (difference 4 to 41%) bacteria (any/HPF) 77.5%, 62.5%, (difference -7 to 37%) epithelial cells (>few) 65%, 30% (difference 13 to 56%) culture contamination (>1000 colony-forming units of commensal or >2 species) 77%, 63% (difference -5 to 35%). The proportion of abnormal results from samples collected by "non-clean" vs. Urinalysis indices and culture contamination were compared.
Samples underwent standard automated urinalysis and culture. In this crossover design, 40 menstrual-age female emergency department staff without UTI symptoms collected urine two ways: directly in a cup ("non-clean") and midstream clean catch ("ideal"). We examine the impact of voided specimen collection technique on urinalysis indicators of UTI and on urine culture contamination in disease-free women. At least four indices, if positive, can indicate UTI. Improper collection technique by the patient may affect the result. Specimens are often collected at triage from women with any abdominal complaint, creating a low UTI prevalence population. Available at.Voided urinalysis to test for urinary tract infection (UTI) is prone to false-positive results for a number of reasons. National Library of Medicine MedlinePlus. Progestin-Only (norethindrone) Oral Contraceptives.
Other factors that can cause inaccurate results on pregnancy tests may include: A false negative pregnancy test can happen because you conceived later than you think, you didnt take the test correctly, your urine was diluted, or even because youre pregnant with multiples. Alcohol and illicit drugs also don’t affect pregnancy test results. Importantly, most medicines will not affect the results of a home pregnancy test. Anti-anxiety medications such as prochlorperazine and trifluoperazine.Sedatives that are used before and after surgery or during labor, such as promethazine.Anti-nausea drugs, including prochlorperazine, perphenazine, chlorpromazine and promethazine.Progestin-only birth control pills, including:.The anti-seizure/anticonvulsant drug carbamazepine used for epilepsy, facial nerve pain and bipolar disorder.Antipsychotics often used to treat schizophrenia, such as perphenazine, prochlorperazine, chlorpromazine, trifluoperazine, thioridazine and thiothixene.Other drugs that may cause a false positive pregnancy test include: Taking any medication that contains hCG can cause a false-positive result.ĭrugs that contain the hCG hormone aimed at boosting fertility may impact pregnancy test results. Home pregnancy tests measure levels of human chorionic gonadotropin (hCG) hormone in urine. Some medications can cause a false positive pregnancy test result.
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