The urine routine examination is in almost every health package, costs very little, and is probably the most misread report people receive. A line saying “pus cells 4–6/hpf” sends plenty of people searching anxiously at midnight, while a protein reading that genuinely matters gets ignored because nobody explained it.
This guide goes through the report section by section: what each finding means, which ones are commonly harmless, and when a result warrants medical attention.
How the Report Is Structured
A urine routine report has three parts:
- Physical examination – colour, appearance, specific gravity
- Chemical examination – the dipstick: pH, protein, glucose, ketones, blood, nitrite, leukocyte esterase, bilirubin, urobilinogen
- Microscopic examination – what is seen under the microscope: pus cells (WBCs), red blood cells, epithelial cells, casts, crystals, bacteria, yeast
A finding in one section is interpreted alongside the others. Microscopy and the dipstick are meant to corroborate each other, which is why a result in isolation can mislead.
Physical Examination
Colour and appearance
Normal urine is pale yellow to amber and clear. Darker urine usually means it is concentrated, most often from not drinking enough. Several foods and medicines change the colour harmlessly: beetroot can turn it reddish, and B-complex vitamins turn it bright yellow. Cloudiness can come from crystals, cells or bacteria.
Red or brown urine that is not explained by food or medicine should always be checked with a doctor.
Specific gravity
This reflects how concentrated the urine is, normally in the range of about 1.005 to 1.030. A high value usually means concentrated urine and preserved kidney concentrating ability; a persistently low value in the absence of high fluid intake can suggest the kidneys are not concentrating well. Protein, glucose and recent contrast dye can make this reading unreliable, and very dilute urine can distort the cell counts reported elsewhere on the same report.
Chemical Examination: The Dipstick
pH
Normal urine pH ranges from about 4.5 to 8. Alkaline urine can suggest urea-splitting organisms such as Proteus, metabolic alkalosis, or a tendency to calcium phosphate stones. Acidic urine is associated with metabolic acidosis and with uric acid, cystine and calcium oxalate stones. Diet also shifts pH, so a single value means little on its own.
Protein
Reported as nil, trace, or 1+ through 4+, roughly corresponding to 30 mg/dL at 1+ and over 2000 mg/dL at 4+.
This is a qualitative test with real limitations: it misses microalbuminuria – the small amounts of albumin that are the earliest sign of kidney damage in diabetes – and it misses Bence-Jones proteins. A proper quantification needs a spot urine protein-to-creatinine ratio or a 24-hour collection, and in diabetes specifically, a urine albumin-to-creatinine ratio.
Persistent protein can indicate albumin loss through the glomerulus, reduced tubular reabsorption, or protein overproduction. Transient protein can follow fever, strenuous exercise or prolonged standing, which is why one reading is repeated before being acted on.
A trace of protein once is common. Protein on repeated samples needs evaluation.
Glucose
Glucose normally appears in urine only when blood glucose exceeds roughly 180 mg/dL and the kidney’s reabsorption threshold is crossed. It also appears in pregnancy and in Fanconi syndrome.
Important: urine glucose is not a diabetes test. It can be negative in someone with diabetes whose blood sugar sits below the threshold. Diagnosis uses blood tests – fasting glucose, post-glucose values and HbA1c.
Ketones
Ketones appear in diabetic or alcoholic ketoacidosis and in starvation, and also during prolonged fasting, very low-carbohydrate diets and vomiting illnesses. The dipstick detects acetoacetate but misses acetone and beta-hydroxybutyrate, so it underestimates total ketones. Levodopa metabolites can cause false positives.
Ketones with high blood sugar is a combination that needs urgent medical attention.
Blood
A positive blood dipstick can mean intact red blood cells, free haemoglobin from lysed cells, or myoglobin from muscle breakdown – the test cannot distinguish them, which is why microscopy matters. Hematuria is conventionally defined as 3 or more red cells per high-power field on at least 2 of 3 specimens. Recent catheter insertion can cause trauma-related blood, and menstruation is a common and harmless source of contamination in women.
Nitrite
Many gram-negative bacteria convert nitrate in urine to nitrite, so a positive nitrite strongly suggests bacterial infection.
Two limitations matter:
- A negative nitrite does not exclude infection. Enterococcus and Staphylococcus saprophyticus are gram-positive and do not produce nitrite.
- Urine must sit in the bladder for more than 4 hours for the conversion to occur, so a sample given shortly after the previous void can be falsely negative. This is why a first-morning sample is preferred.
Leukocyte esterase
An enzyme from white blood cells, screening for more than 10 WBC per high-power field. A positive result suggests urinary infection, pyelonephritis or interstitial nephritis. Vaginal contamination causes false positives, while high specific gravity or glucose in the urine can cause false negatives. It should always be correlated with microscopy.
Bilirubin and urobilinogen
Normally only conjugated bilirubin appears in urine. Bilirubin in urine can be an early indicator of liver or biliary disease, usually followed up with liver function tests.
Microscopic Examination
Pus cells (white blood cells)
The line people worry about most. A small number of white cells is normal. Laboratories commonly report up to about 5 per high-power field as within normal limits, though reference ranges differ between labs, so read your own report’s stated range.
Raised pus cells suggest inflammation somewhere in the urinary tract, most often infection. But raised counts also occur with:
- Contamination of the sample, particularly in women
- Vaginal discharge
- Recent sexual activity
- Kidney stones
- Interstitial nephritis
White cell casts – white cells clumped in a cylindrical cast formed in the kidney tubule – point specifically to pyelonephritis or interstitial nephritis, rather than a simple bladder infection. Eosinophils, which need a special stain, suggest acute interstitial nephritis.
Red blood cells
A few may be normal. Dysmorphic red cells, or red cell casts, point to glomerular disease and warrant a nephrology opinion. In women, menstruation is the first thing to exclude before investigating.
Epithelial cells
Squamous epithelial cells in large numbers usually indicate contamination from the skin or genital area, meaning the sample was not collected cleanly. A report with many squamous cells alongside bacteria often reflects collection technique rather than infection, and the test may need repeating with a proper clean-catch midstream sample.
Renal tubular epithelial cells are a different matter and, with renal tubular casts, suggest acute tubular necrosis.
Crystals
Calcium oxalate, uric acid, triple phosphate and other crystals are frequently seen and are often of no significance in a single sample, particularly if the sample sat before analysis. They are more relevant in someone with a history of stones, in which case a doctor may investigate further.
Bacteria and yeast
Bacteria seen on microscopy may indicate infection or contamination. A urine culture distinguishes between the two by growing the organism, identifying it and testing which antibiotics work against it. Yeast may indicate candiduria or contamination.
How to Collect the Sample Properly
A large share of abnormal urine reports are collection problems, not medical problems.
- First-morning sample is preferred, since it is most concentrated and has sat in the bladder long enough for nitrite conversion.
- Clean the genital area before collecting.
- Midstream catch: pass the first part of the stream into the toilet, collect the middle portion in the container, and finish in the toilet. The first part washes out contaminants from the urethra.
- Do not touch the inside of the container or its lid.
- Women should avoid testing during menstruation where possible, since blood and cells contaminate the sample.
- Deliver the sample promptly. Cells break down and bacteria multiply in a sample left standing, which changes the result.
Urine Routine vs Urine Culture
| Urine routine | Urine culture | |
|---|---|---|
| What it does | Screens for abnormalities | Grows and identifies bacteria |
| Result time | Same day | Usually 48–72 hours |
| Tells you | Whether something looks abnormal | Which organism, and which antibiotics work |
| Used for | Screening, first assessment | Confirming infection and guiding antibiotic choice |
A urine routine suggesting infection is often followed by a culture, especially for recurrent infections, in pregnancy, in men, in children, or where a first course of antibiotics has failed.
Bacteria Without Symptoms: When Not to Treat
This is one of the more useful things to know, and it runs against instinct.
Asymptomatic bacteriuria means bacteria are present in the urine without any urinary symptoms. The 2019 Infectious Diseases Society of America guideline recommends against screening or treating it in most groups, including healthy non-pregnant women, people with diabetes, older adults in the community or in long-term care, people with indwelling catheters, and those undergoing elective non-urologic surgery. The reason is antimicrobial resistance: treating does not help, and it drives resistance.
The guideline also advises that in older patients with bacteriuria and delirium, but without urinary symptoms or other signs of infection, clinicians should look for other causes and observe rather than prescribe antibiotics.
The exceptions where screening and treatment are recommended:
- Pregnancy
- Before endoscopic urologic procedures involving mucosal trauma
In short: bacteria on a report is not automatically a reason for antibiotics. Symptoms plus findings, interpreted by a doctor, decide that.
Symptoms That Need Medical Attention
See a doctor promptly for:
- Burning or pain while passing urine
- Needing to pass urine frequently or urgently
- Fever with chills and back or flank pain, which suggests kidney involvement
- Visible blood in urine
- Persistent cloudy or foul-smelling urine
- Reduced urine output
- Swelling of the face, feet or ankles alongside protein in the urine
Men with urinary symptoms, children, pregnant women and anyone with recurrent infections should be evaluated rather than self-treating.
Frequently Asked Questions
1. What does a urine routine test show?
It screens for abnormalities across three areas: physical (colour, appearance, specific gravity), chemical (pH, protein, glucose, ketones, blood, nitrite, leukocyte esterase, bilirubin), and microscopic (pus cells, red cells, epithelial cells, casts, crystals, bacteria). It is a screening test, not a diagnosis.
2. What is the normal pus cell count in urine?
A small number of white cells is normal, and laboratories commonly report up to about 5 per high-power field as within normal limits. Reference ranges vary between labs, so read the range printed on your own report and review raised counts with a doctor.
3. Do pus cells in urine always mean infection?
No. Raised pus cells can also result from sample contamination, vaginal discharge, recent sexual activity, kidney stones or interstitial nephritis. Contamination is common, particularly when the sample is not a clean-catch midstream collection. A urine culture distinguishes genuine infection from contamination.
4. What does protein in urine mean?
A trace of protein on one sample is common and can follow fever, strenuous exercise or prolonged standing. Protein on repeated samples needs evaluation, since it can indicate kidney damage. The dipstick is qualitative and misses microalbuminuria, so quantification uses a urine protein-to-creatinine ratio or, in diabetes, an albumin-to-creatinine ratio.
5. Can a urine test detect diabetes?
Not reliably. Glucose appears in urine only when blood glucose exceeds roughly 180 mg/dL, so someone with diabetes can have a negative urine glucose. Diabetes is diagnosed with blood tests: fasting glucose, 2-hour post-glucose values and HbA1c.
6. What is the difference between a urine routine test and a urine culture?
A urine routine screens for abnormalities and gives a same-day result. A urine culture grows the bacteria, identifies the organism and tests which antibiotics work against it, usually taking 48 to 72 hours. A culture is typically ordered when infection is suspected or when a first treatment has failed.
7. Why is a first-morning urine sample preferred?
It is the most concentrated sample of the day, which makes abnormalities easier to detect. It has also sat in the bladder long enough for bacteria to convert nitrate to nitrite, since that conversion needs more than four hours. A sample given shortly after the previous void can be falsely negative for nitrite.
8. How should I collect a urine sample correctly?
Use a first-morning sample, clean the genital area, then collect a midstream catch: pass the first part into the toilet, collect the middle portion, and finish in the toilet. Avoid touching the inside of the container, avoid collecting during menstruation where possible, and deliver the sample promptly.
9. Does bacteria in urine always need antibiotics?
No. The 2019 IDSA guideline recommends against screening or treating asymptomatic bacteriuria in most groups, including healthy non-pregnant women, people with diabetes, older adults and those with catheters, because treatment does not help and drives antibiotic resistance. Pregnancy and certain urologic procedures are the main exceptions.
10. What do crystals in a urine report mean?
Calcium oxalate, uric acid and other crystals are frequently seen and often have no significance in a single sample, especially if the sample stood before analysis. They carry more weight in someone with a history of kidney stones, where a doctor may investigate further.
11. What do epithelial cells in urine indicate?
Squamous epithelial cells in large numbers usually indicate contamination from the skin or genital area, meaning the sample was not collected cleanly, and the test may need repeating. Renal tubular epithelial cells are different and, with renal tubular casts, suggest kidney tubule injury.
12. Can a urine test be done at home in Pune?
Yes. A urine sample can be collected at home in a sterile container provided by the lab and taken for processing, and Fittr Labs offers home sample collection in Pune. Use a first-morning clean-catch midstream sample and make sure it reaches the lab promptly, since delays change the result.
