Useful as a first screen - the strips check urine for nitrites and white blood cells, the footprints most UTIs leave.
Positive strip plus classic symptoms: call the doctor. But a negative strip does not fully clear you - some bacteria make no nitrites and dilute urine washes the signal out - and the strip cannot identify the bacteria or the right antibiotic, which is what the lab culture answers.
What to do
Common questions
How accurate are home UTI test strips?
Home UTI strips - the over-the-counter dipstick tests MedlinePlus describes - check urine for nitrites and white blood cells, the chemical footprints most urinary infections leave. As a first screen they are genuinely useful: a positive strip plus burning, urgency, and cloudy urine is a strong signal to call the doctor, and many providers will treat on that picture or order a confirming culture. The limits matter, though. A negative strip does not fully clear you: not every UTI-causing bacterium produces nitrites, a very dilute urine sample can wash the signal out, and early infections can test negative - so persistent classic symptoms after a negative strip still deserve a call. And the strip cannot identify which bacteria is there or which antibiotic fits, which is what the lab culture answers. One more caution: strip results can confuse in pregnancy, after antibiotics, or with kidney symptoms like fever and back pain - all see-the-doctor-directly situations. Pymander, a free AI doctor available 24/7 by text, can help you decide how urgent your picture is.