A urine routine and microscopy report gives clues about infection, blood, protein loss, stones, diabetes and kidney disease. No single line should be read in isolation. “Pus cells” are white blood cells, but they do not always mean bacterial UTI; “blood positive” on a dipstick should be interpreted with microscopy; and bacteria can reflect contamination if the sample was not collected properly. Symptoms, urine culture and kidney/urological evaluation determine what an abnormal result actually means.

What the dipstick section means

Leukocyte esterase and nitrite

Leukocyte esterase suggests white blood cells. Nitrite can support bacterial UTI because some bacteria convert nitrate to nitrite, but many organisms do not. A negative nitrite does not rule out infection.

Blood

Dipstick blood detects haem pigment and can be positive with red blood cells, haemoglobin or myoglobin. Microscopy helps confirm whether RBCs are actually present. Persistent microscopic blood may require urological evaluation depending on age and risk factors.

Protein

Trace protein can occur transiently with fever, exercise or concentrated urine. Persistent protein is better quantified with urine albumin-to-creatinine or protein-to-creatinine ratio and may indicate kidney disease rather than a purely urological problem.

Glucose and ketones

Glucose can appear with high blood sugar or certain diabetes medicines. Ketones may occur with fasting, vomiting or poorly controlled diabetes. These findings need metabolic assessment rather than urological treatment alone.

Microscopy: RBCs and WBCs

Laboratories may report cells per high-power field (HPF) or per microlitre. Reference ranges vary. Increased RBCs can occur with stones, infection, prostate bleeding, kidney disease, trauma or urinary tract tumours. Increased WBCs can occur with infection, stones, inflammation or contamination.

Epithelial cells and bacteria

A few squamous epithelial cells are common. Many squamous cells suggest contamination from skin/genital surfaces, which can also make “bacteria present” difficult to interpret. A properly collected midstream clean-catch sample improves reliability. Culture is the test used to identify a bacterial organism and its antibiotic susceptibility when clinically indicated.

Crystals

Crystals such as calcium oxalate, uric acid or phosphate can be seen in healthy people and do not by themselves diagnose a kidney stone. Their significance depends on urine pH, concentration, recurrent stone history and metabolic evaluation. Cystine crystals are unusual and can be diagnostically important.

Casts

Casts form within kidney tubules. Hyaline casts can be nonspecific, while red-cell casts, white-cell casts or certain granular casts may point toward intrinsic kidney disease and require medical/nephrology assessment. A routine report should not be used alone to subtype kidney disease.

When is urine culture needed?

Culture is particularly important with fever/pyelonephritis, complicated UTI, recurrent or non-resolving symptoms, pregnancy and patients at higher risk of resistant organisms. Antibiotics taken before the sample can suppress bacterial growth and produce a false-negative culture.

Collection and reporting pitfalls

Exercise, menstruation/contamination, dehydration and delayed laboratory processing can alter some urine findings. A very concentrated sample can make dipstick results appear stronger, while a very dilute sample may reduce microscopy yield. If persistent microscopic blood or protein is being evaluated, a repeat properly collected sample may be more informative than reacting to one borderline report.

Laboratory reference ranges and reporting units differ. “RBC 5-10/HPF” should be compared with that laboratory’s method; automated particle counts reported per microlitre are not numerically interchangeable with manual high-power-field counts.

A practical hierarchy for an abnormal urine routine

When a urine report is abnormal, first ask whether the sample was collected properly and whether the patient has symptoms. Then group the findings: inflammatory (WBC/pus cells, leukocyte esterase, nitrite), bleeding (RBC/blood), kidney-related (protein, casts), metabolic (glucose/ketones/crystals) and contamination markers (many squamous epithelial cells, mixed bacteria).

This prevents a common mistake: treating ‘pus cells’ with antibiotics without proving a symptomatic bacterial infection. In a patient with fever, flank pain, pregnancy, recurrent UTI, male UTI or planned urinary instrumentation, urine culture becomes much more important.

What to bring for consultation

• The complete urine report with laboratory reference ranges.
• Urine culture if performed.
• Creatinine/eGFR if blood or protein persists.
• Ultrasound/CT if stones or obstruction are suspected.
• List of antibiotics already taken and timing relative to sample collection.

FAQs

Related reading

• Urine Culture and Sensitivity Report Explained
• Serum Creatinine Test Explained
• Kidney Stone Analysis Report Explained
• Ultrasound KUB Report Explained
• Urologist in Latur

References

• European Association of Urology. EAU Guidelines on Urological Infections. 2026 https://uroweb.org/guidelines/urological-infections
• European Association of Urology. EAU Guidelines on the Management of Non-neurogenic Male LUTS: Diagnostic Evaluation. 2026 https://uroweb.org/guidelines/management-of-non-neurogenic-male-luts/chapter/diagnostic-evaluation
• Kidney Disease: Improving Global Outcomes (KDIGO). 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int. 2024;105(Suppl 4S):S117-S314 https://kdigo.org/guidelines/ckd-evaluation-and-management/