Urinalysis Explained: Reading Every Dipstick Line
Content last reviewed 2026-09-12 · Educational information — not medical advice
Quick answer
Urinalysis interrogates urine ten ways at once — concentration, protein, blood, sugar, infection signs, pH — plus microscope sediment. It's the cheapest broad-screen in medicine, guiding UTI diagnosis, kidney surveillance, and diabetes discovery from a single cup.
Line-by-line dipstick decoder
- Specific gravity — concentration/hydration status
- pH — acid-base tendencies (stone-type clues)
- Protein — kidney-filter integrity (persistent = nephrology referral)
- Glucose — spills when blood sugar exceeds renal threshold
- Ketones — starvation/keto/DMAsignature
- Blood — stones/infection/cancer concern if persistent unexplained
- Leukocyte esterase + nitrite — the bacterial-infection duo
- Bilirubin/urobilinogen — liver/bile overflow signals
Microscopy adds the texture
Centrifuged sediment reveals: casts (kidney-tubule molds — RBC casts scream glomerulonephritis), crystals (stone chemistry preview), cells (WBCs=infection/inflammation, eosinophils=interstitial nephritis hints), bacteria (quantified, cultured when warranted).
UTI diagnosis mechanics
Nitrite-positive + leukocyte-esterase-positive in symptomatic women treats empirically; culture confirms species/sensitivities when recurrence, pregnancy, or treatment failure complicate. Asymptomatic bacteriuria differs categorically — treated ONLY in pregnancy and pre-procedure contexts.
Collection quality decides everything
Clean-catch midstream technique prevents genital contamination false-positives; first-morning specimens concentrate findings; delayed transport lets bacteria multiply into fake infections. The cup technique matters as much as the laboratory.
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Frequently asked questions
Blood in urine but no pain — serious?
Persistent painless hematuria earns urologic evaluation (bladder-cancer rule-out) regardless of how benign it feels — painlessness is precisely the concerning flavor.
Can exercise cause abnormal urinalysis?
Vigorously — proteinuria, hematuria, and casts all follow marathons; repeat 48-72hrs post-exertion before alarming.