Urine Routine and Microscopy: Normal Values and How to Read Your Report
A urine routine examination checks the physical appearance, chemical composition and microscopic contents of urine in a single test. Normal urine contains no protein, no sugar, no ketones, no blood, fewer than 5 pus cells and fewer than 3 red cells per high power field. It is the simplest window into kidney, urinary tract and metabolic health.
Core & Routine Blood Tests
18 Parameters
Urine (2 mL)
4 Hours
Preparation & Fasting Guidelines
Detailed Clinical Overview
A urine routine has three parts. The physical examination records colour, appearance and specific gravity, which reflects concentrating ability. The chemical examination, done by dipstick, tests for protein, glucose, ketones, blood, bilirubin, urobilinogen, nitrite, leucocyte esterase and pH. The microscopic examination of the centrifuged deposit looks for pus cells, red cells, epithelial cells, casts, crystals, bacteria, yeast and parasites.
The microscopy is what makes the test diagnostic rather than merely suggestive. Casts in particular carry specific meaning: red cell casts point to glomerular bleeding and are effectively diagnostic of glomerulonephritis; white cell casts point to kidney rather than bladder infection; and granular casts indicate tubular injury.
The result depends heavily on how the sample was collected. A first-morning midstream sample after cleaning the genital area gives the most concentrated and least contaminated specimen. A sample with many squamous epithelial cells is contaminated and cannot be interpreted, which is the commonest reason a urine report has to be repeated.
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Frequently Asked Questions
Q: What are normal urine routine values?
A: Pale yellow clear urine, pH 4.6 to 8.0, specific gravity 1.005 to 1.030, no protein, no glucose, no ketones, no blood, negative nitrite, fewer than 5 pus cells and fewer than 3 red cells per high power field, and only occasional hyaline casts.
Q: What do pus cells in urine mean?
A: More than 5 pus cells per high power field suggests inflammation in the urinary tract, most commonly infection — particularly if nitrite and leucocyte esterase are also positive. A urine culture is needed to identify the organism and guide antibiotic choice. Pus cells with a sterile culture raise other possibilities including stones or tuberculosis.
Q: How should I collect a urine sample correctly?
A: Use first-morning urine where possible. Clean the genital area with water, begin passing urine into the toilet, then collect the middle portion in the sterile container without touching the inside. Collect at least 10 mL and get it to the laboratory within an hour, or refrigerate it and deliver within four.
Q: What does protein in urine mean?
A: Protein in urine can be transient — after fever, exercise or prolonged standing — or persistent, which indicates kidney damage. Any dipstick reading of 1+ or more should be quantified with a urine protein-to-creatinine ratio and repeated. Persistent proteinuria is one of the strongest predictors of progressive kidney disease.
Q: Can I give a urine sample during my period?
A: It is better to wait. Menstrual blood contaminates the sample with red cells and epithelial cells and makes the result uninterpretable. If the test cannot be postponed, tell the laboratory so the report can be qualified appropriately.
Q: What does sugar in urine mean?
A: Glucose appears in urine when blood glucose exceeds the renal threshold of about 180 mg/dL, so it usually indicates poorly controlled diabetes. It is also expected in anyone taking an SGLT2 inhibitor such as dapagliflozin or empagliflozin, where glycosuria is the intended mechanism of the drug and not a sign of poor control.
Q: Is a urine routine enough to diagnose a urine infection?
A: It gives a strong indication but not a definitive one. Pus cells with positive nitrite and leucocyte esterase make infection very likely, but only a urine culture identifies which organism is responsible and which antibiotics will work. In recurrent or complicated infections, a culture is essential rather than optional.
Q: What does blood in urine without pain mean?
A: Painless visible blood in urine in an adult, particularly over the age of 40, should always be investigated — it can indicate a bladder or kidney tumour, and it is one of the most important findings in urology not to dismiss. It can also come from stones, infection or glomerular disease, but the serious causes must be excluded first.
Q: Why do I need a microalbumin test if my urine routine is normal?
A: A dipstick only detects protein above roughly 300 mg per day, while early diabetic kidney damage produces 30 to 300 mg per day. That means the routine test will read normal for years while damage is progressing. A urine albumin-to-creatinine ratio is what detects it, and it is recommended annually in diabetes and hypertension.
Q: What do crystals in urine mean?
A: Crystals are often incidental and appear as urine cools or stands. Calcium oxalate and uric acid crystals are common and do not by themselves mean you have stones. Certain crystals are significant — cystine crystals indicate cystinuria, and abundant crystals with loin pain or blood warrant imaging.
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