# Urine Dipstick: A Screen That Needs Context

Confirm the important signal with the next appropriate test: microscopy for blood, ACR for albumin, culture for selected infection syndromes, or blood ketones for ketoacidosis.

![Infographic: Urine Dipstick: A Screen That Needs Context](https://urinenephrology.org/visual-reference/images/urine-dipstick.png?v=20261003c)

## Start with the specimen

Use a properly collected fresh sample and process promptly. Menstrual contamination, exercise, infection, concentration, and storage can alter results. Check whether an abnormality persists after a transient explanation resolves; the strip is a screening reaction, not a tissue diagnosis.

## Heme positive: look for red cells

Confirm dipstick blood with microscopy. Numerous RBCs support hematuria; heme with few or no RBCs raises myoglobin, hemoglobin, or lysed cells. Muscle pain plus a high CK supports rhabdomyolysis; anemia and hemolysis findings support hemoglobinuria. Neither is diagnosed by the strip alone.

## Protein positive: quantify it

Dipstick protein preferentially detects albumin and varies with concentration. Obtain urine ACR, preferably first morning, to classify albuminuria: <30, 30–300, or >300 mg/g. Confirm persistence. Discordantly high total protein with little albumin suggests nonalbumin proteins and can prompt monoclonal-protein testing.

## Leukocytes and nitrite: use symptoms

Leukocyte esterase supports pyuria; nitrite requires suitable organisms and bladder dwell time. A negative nitrite does not exclude UTI. Dysuria or systemic features determine the clinical pathway; asymptomatic pyuria or bacteriuria usually does not justify antibiotics.

## Glucose and ketones: reconcile the drugs

Glycosuria may reflect hyperglycemia, an SGLT2 inhibitor, or proximal tubular dysfunction. Urine ketone strips underdetect beta-hydroxybutyrate. In illness with acidosis or suspected ketoacidosis, measure blood beta-hydroxybutyrate even if urine ketones or glucose seem reassuring.

## Specific gravity and pH: support, not verdict

Concentrating ability, solutes, and measurement method influence specific gravity; use urine osmolality for a focused water-balance question. Urine pH helps assess stones or acidification but changes with diet, storage, infection, and treatment. No isolated strip value reliably distinguishes prerenal from intrinsic AKI.

## Supporting evidence

- [Official clinical guidance](https://kdigo.org/wp-content/uploads/2026/04/KDIGO-2024-CKD-Guideline.pdf)
- [Official clinical guidance](https://www.idsociety.org/practice-guideline/asymptomatic-bacteriuria/)
- [PubMed 39052901](https://pubmed.ncbi.nlm.nih.gov/39052901/)

## Source lessons

- [dipstick](https://urinenephrology.org/2025_UDPA_Lectures_Live/urinalysis/dipstick.html)
- [index](https://urinenephrology.org/2025_UDPA_Lectures_Live/urinalysis/index.html)

Read alongside the full lessons; the findings and decisions shown here require the stated clinical context.