How to Read a Urinalysis: Full Guide to Your Results

You're looking at a urinalysis report filled with numbers, symbols, and Latin abbreviations — and it's not obvious what any of it means. The good news: urinalysis follows a consistent logic, and most values can be understood once you know a few basic principles. This is a complete guide to the UA report: from color to sediment, with reference values and plain-language explanations for every section.

What a Urinalysis Measures and Why It Matters

Urine is a concentrate of what the kidneys filtered from the blood. Its composition reflects the function of several systems at once: the urinary tract, the endocrine system, and the vasculature. That's why urinalysis is included in the standard workup for a wide range of conditions — including many that have nothing to do with the kidneys directly.

The report is divided into three sections:

• Physical properties — color, clarity, odor, specific gravity, pH
• Chemical markers — protein, glucose, ketones, bilirubin, urobilinogen, nitrites, blood
• Urine sediment microscopy — leukocytes, red blood cells, casts, epithelial cells, bacteria, crystals

Each section provides a different dimension of information. Accurate interpretation always means reading the full picture — not any single value in isolation.

Physical Properties: Reference Values and What Deviations Mean

Physical parameters are assessed visually and with a urinometer. Many can be noticed before submitting the sample.

Parameter	Normal	Deviation and possible cause
Color	Pale to medium yellow	Colorless — excess fluids, diabetes insipidus; dark yellow — dehydration; reddish — RBCs or food pigments; brown — hemoglobin, bile pigments
Clarity	Clear	Cloudy — leukocytes, bacteria, mucus, salt crystals
Odor	Mild, characteristic	Acetone — ketones; ammonia — bladder infection; fruity — decompensated diabetes
Specific gravity	1.010–1.025	< 1.010 — renal insufficiency, diabetes insipidus; > 1.025 — dehydration, glycosuria
pH	5.0–7.0	< 5.0 — acidosis, high-protein diet; > 7.0 — infection, vegetarian diet, renal tubular acidosis

Specific gravity is a sensitive indicator of the kidney's ability to concentrate urine. A monotonously low specific gravity of around 1.010 in all urine fractions throughout the day is a finding that deserves dedicated investigation.

Chemical Markers: Protein, Glucose, Ketones and More

The chemical panel is the core of the urinalysis. This is where substances that should not normally be in urine are identified, or where concentrations exceed acceptable limits.

Marker	Normal	Deviation: what it may indicate
Protein (PRO)	Negative or < 0.14 g/L	Elevated — nephritis, nephrotic syndrome, urinary tract infection, preeclampsia
Glucose (GLU)	Negative	Present — diabetes mellitus, renal glucosuria, acute pancreatitis
Ketones (KET)	Negative	Present — fasting, ketogenic diet, diabetic ketoacidosis, pregnancy sickness
Bilirubin (BIL)	Negative	Present — hepatic or obstructive jaundice, hepatitis
Urobilinogen (URO)	Trace (up to 17 µmol/L)	Elevated — hemolysis, liver disease; absent — bile duct obstruction
Nitrites (NIT)	Negative	Positive — bacteriuria, urinary tract infection
Blood / hemoglobin (BLD)	Negative	Positive — red blood cells in urine, hemolysis, myoglobinuria

Protein in urine is one of the most clinically significant values. Even a modest sustained elevation above the reference range warrants further investigation — what it can mean is covered in detail in the article on protein in urine.

Ketones in urine should be interpreted alongside blood glucose: ketones with normal blood sugar usually point to fasting or a low-carbohydrate diet; ketones with elevated blood sugar require ruling out diabetic ketoacidosis. The clinical significance of each dipstick grade is explained in the article on ketones in urine.

Urine Sediment Microscopy: Leukocytes, RBCs and Casts

Microscopy is the most informative section for diagnosing inflammation and kidney tissue damage. The lab technician centrifuges the sample and examines the pellet under a microscope.

Element	Normal	Deviation: what it may indicate
Leukocytes (WBC)	F: up to 6/hpf; M: up to 3/hpf	Elevated — cystitis, pyelonephritis, urethritis, prostatitis
Red blood cells (RBC)	0–2 per field	Elevated — kidney stones, glomerulonephritis, tumor, trauma
Hyaline casts	0–1 per field	A few — normal; many — exercise, fever, dehydration
Granular casts	Absent	Present — glomerulonephritis, pyelonephritis, diabetic nephropathy
Red cell casts	Absent	Present — acute glomerulonephritis, vasculitis, endocarditis
Squamous epithelium	Few	Many in women — sample contamination from vaginal secretions
Renal tubular epithelium	Absent	Present — tubular injury
Bacteria	Absent	Present — urinary tract infection (with correct collection)
Oxalate crystals	Few	Many — oxaluria, kidney stone risk

Red cell casts are among the most specific signs of glomerular damage. Their detection always calls for nephrology consultation.

Elevated leukocytes in the sediment are the most common incidental finding in routine urinalysis. Reference values, causes, and clinical approach are covered in the article on leukocytes in urine.

How to Collect Urine Correctly for Reliable Results

A perfectly analyzed specimen is worthless if it was collected incorrectly. The vast majority of "abnormal" urinalyses are the result of collection errors, not actual disease.

The day before:

• Avoid beets, carrots, and blueberries — they discolor urine
• Skip diuretics and high-dose vitamin C — they distort chemical markers
• Limit intense exercise — protein and casts can transiently rise after heavy workouts

On collection day:

• Use the first morning void — most concentrated and informative
• Wash without antibacterial soap; collect the midstream portion
• Use a sterile pharmacy container
• Deliver to the lab within 1–2 hours; do not leave in a warm environment

Women should postpone the test 3–5 days after the end of menstruation — blood will reliably distort sediment and chemical values.

When the Result Needs to Be Repeated

A single abnormal value is not a diagnosis. Before drawing conclusions, the physician checks whether there are technical reasons for a false result.

A repeat urinalysis is required when:

• The first sample was collected incorrectly
• Leukocytes or protein were found with no clinical symptoms — contamination must be excluded
• The deviation is mild and borderline
• More than 2 hours elapsed between collection and analysis

If the deviation is confirmed on a repeat test, further workup is ordered: Nechiporenko count, Zimnitsky test, 24-hour proteinuria, or urine culture.

When Urinalysis Results Require Prompt Medical Attention

Most urinalysis abnormalities warrant a scheduled visit to a GP or nephrologist. But certain findings call for immediate action.

Seek medical care promptly if the urinalysis shows:

• Red cell casts — sign of acute glomerulonephritis
• Significant proteinuria (> 3 g/L) — possible nephrotic syndrome
• Glucose and ketones together with symptoms — suspected diabetic ketoacidosis
• Marked leukocyturia (> 50/hpf) with fever above 38°C — acute pyelonephritis
• Gross hematuria (visibly red urine) — requires urgent exclusion of tumor or severe inflammation

If you are pregnant and find any of the above — go to the hospital without waiting for a scheduled appointment.

This article is for informational purposes only and does not replace professional medical advice. Urinalysis interpretation should be performed by a clinician in the context of the patient's full clinical picture.