Urinalysis Test
Test Overview
A urinalysis provides a snapshot of your overall health and can reveal abnormalities that might indicate an underlying medical condition. It assesses various components in the urine that can signify inflammation, infection, metabolic imbalances, or organ dysfunction. The test typically involves three main parts:
- Macroscopic (Physical) Examination: Visual assessment of the urine’s color, clarity, and odor.
- Chemical Examination (Dipstick Test): Uses a reagent strip (dipstick) to detect and measure various chemical substances.
- Microscopic Examination: Examination of a small amount of urine under a microscope to identify and count cells, casts, crystals, and bacteria.
Test Types
- Routine Diagnostic Screening Test: It’s often one of the first tests performed during a medical check-up, when a patient presents with symptoms, or to monitor certain conditions.
- Qualitative and Semi-Quantitative: The dipstick provides qualitative (positive/negative) or semi-quantitative (trace, small, moderate, large) results, while the microscopic exam provides quantitative counts (e.g., number of cells per high power field).
Urynalisys Test Results & Ranges
| Parameter | Normal Range (Typical) | Abnormal/Significant Findings (May Indicate) |
| Physical Exam | ||
| Color | Pale yellow to amber | Dark yellow (dehydration), red/pink/brown (blood), orange/green (medications/liver issues), cloudy (infection/crystals) |
| Clarity | Clear | Hazy, cloudy, turbid (white blood cells, red blood cells, bacteria, crystals, lipids) |
| Odor | Mild, characteristic | Strong/foul (infection), sweet/fruity (diabetes), maple syrup odor (metabolic disorder) |
| Chemical Exam (Dipstick) | ||
| Specific Gravity | 1.005 – 1.030 | High (dehydration, large molecules), Low (overhydration, kidney inability to concentrate urine) |
| pH | 4.5 – 8.0 (average 6.0) | High (alkaline: UTIs, kidney stones), Low (acidic: diabetic ketoacidosis, dehydration, certain foods) |
| Protein | Negative or Trace (0-8 mg/dL) | Positive (kidney damage, inflammation, infection, certain diseases like diabetes or hypertension) |
| Glucose | Negative | Positive (diabetes, kidney tubular defects) |
| Ketones | Negative | Positive (diabetic ketoacidosis, starvation, low-carb diets, prolonged vomiting) |
| Blood | Negative | Positive (UTI, kidney stones, kidney disease, trauma, menstruation) |
| Bilirubin | Negative | Positive (liver disease, bile duct obstruction) |
| Urobilinogen | Small amount (0.2-1.0 mg/dL) | High (liver disease, hemolytic anemia), Low/Negative (bile duct obstruction) |
| Nitrite | Negative | Positive (bacterial UTI, especially by Gram-negative bacteria like E. coli) |
| Leukocyte Esterase | Negative | Positive (presence of white blood cells/pus in urine, indicating infection or inflammation, e.g., UTI) |
| Microscopic Exam | ||
| Red Blood Cells | 0-2 per high power field (HPF) | Elevated (>2-3 HPF) (UTI, kidney stones, kidney disease, bladder cancer, trauma) |
| White Blood Cells | 0-5 per HPF | Elevated (>5-10 HPF – Pyuria) (infection/inflammation, e.g., UTI, kidney infection) |
| Epithelial Cells | Few (normal shedding) | Increased (contamination, inflammation) |
| Casts | Negative or rare hyaline casts | Positive (kidney disease – types like red cell, white cell, granular, waxy casts indicate specific kidney damage) |
| Crystals | Few (normal, depending on diet/meds) | Numerous or specific types (kidney stones, metabolic disorders, certain medications) |
| Bacteria | Negative or few (contamination) | Moderate to numerous (bacterial infection, e.g., UTI) |
| Yeast | Negative | Positive (fungal infection, common in immunocompromised individuals or diabetics) |
Expected Turnaround Time
- Rapid Results: A urinalysis is typically a very fast test.
- Dipstick Results: Available within minutes at the point of care (e.g., doctor’s office, urgent care).
- Full Microscopic Analysis: Usually available within a few hours to a few business hours, depending on lab volume.
Test Details:
- Specimen: Urine (midstream clean-catch preferred).
- Volume: 10-15 mL.
- Container: Sterile, leak-proof cup.
- Handling: Analyze within 1 hour or refrigerate for up to 4 hours.
Collection Instructions
- Wash Hands: Clean hands thoroughly.
- Clean Genital Area: Use an antiseptic wipe to clean around the urinary opening (front to back for females).
- Start Urinating: Briefly urinate into the toilet.
- Collect Sample: Place the sterile cup into the stream to collect the “midstream” urine.
- Finish Urinating: Remove the cup and finish voiding into the toilet.
- Secure & Label: Cap the container tightly and label it.
- Submit Promptly: Deliver to the lab immediately, or refrigerate if delayed.
Test Details
The procedure for a urinalysis is simple: a urine sample is collected, ideally as a “midstream clean-catch” to minimize contamination from skin bacteria. The sample is then visually inspected, tested with a chemical dipstick that changes color in the presence of certain substances, and finally, a small portion is spun down in a centrifuge, and the sediment is examined under a microscope. This comprehensive approach allows for detection of overt signs of disease as well as subtle indicators not visible to the naked eye.
A urinalysis is a common test that examines urine’s physical, chemical, and microscopic properties to screen for various health conditions, including UTIs, kidney disease, and diabetes.