“Learn the essential ways for urine specimen collection, including step-by-step instructions for correct lab results. Improve your healthcare practices today!”
Introduction
Urine specimen collection is a critical procedure in healthcare, ensuring correct diagnosis through laboratory tests. Proper collection ways decrease contamination and yield reliable results. This guide will explore the best practices for urine specimen collection, including physical, chemical, and microscopic examinations.
Table of Contents
Specimens and Urine Examination
Definition of Specimen
- A specimen is a small quantity of a substance that is the kind and quality of the whole. For example, blood or urine specimens.
Types of Urine Examination
- Physical Examination
- Color: Normal urine is pale yellow to amber.
- Appearance: Should be clear with no deposits.
- Volume: 1000 to 2000 ml in 24 hours.
- Reaction: Slightly acidic (pH below 7).
- Specific Gravity: Ranges from 1.016 to 1.025.
- Odor: Aromatic when fresh.
- Chemical Examination
- Routine Tests: Includes tests for albumin and sugar.
- Special Tests: Tests for acetone, bile pigments, and bile salts.
- Microscopic Examination
- Checks for deposits, pus cells, red blood cells (RBCs), casts, epithelial cells, and bacteria.
Collection of Urine Specimens for Laboratory Tests
- Single Urine Specimen
- Method: Collect 100-120 ml of urine after cleaning the genital area. The specimen is collected in a clean container.
- Midstream Urine Specimen for Culture
- Method: Clean genital area with soap and water. The client begins to void, stops midstream to collect urine in a sterile container, then resumes voiding.
- 24-Hour Urine Specimen
- Method: Start collection at 6 AM after discarding the first void. Collect all urine for the next 24 hours in a labeled container, including the final void at 6 AM the next day.
- Urine Specimen from Unconscious Patients and Children
- Method: For males, use a test tube or a syringe barrel attached to the penis with adhesive tape. For women, use a wide-mouthed container with rubber tubing connected to a bottle, secured by a ‘T’ binder.
Characteristics of Normal Urine
- Volume: 1000 to 2000 ml in 24 hours, varying with fluid intake and weather.
- Color: Pale yellow or amber; deeper yellow with less urine.
- Appearance: Clear with no deposits.
- Odor: Aromatic when fresh.
- Reaction: Slightly acidic (pH below 7).
- Specific Gravity: 1.016 to 1.025.
- Constituents: 96% water, 2% urea, and 2% other compounds like uric acid, creatinine, and salts.
Characteristics of Abnormal Urine
- Volume Abnormalities
- Polyuria: Abnormally high urine volume, often seen in diabetes mellitus and diabetes insipidus.
- Oliguria: Decreased urine output, commonly part of heart disease.
- Anuria: Marked decrease or total absence of urine, indicating possible kidney failure (suppression).
- Color Abnormalities
- Green or Brownish Yellow: Presence of bile salts and bile pigments.
- Reddish Brown: Indicates urobilinogen.
- Bright Red: Large amounts of fresh blood.
- Pink: Small amounts of fresh blood.
- Smoky Brown: Presence of blood pigments.
- Milky White: Chyluria, often due to filariasis.
- Haematuria: Presence of blood in the urine.
- Odor Abnormalities
- Sweetish or Fruity Odor: Indicates the presence of ketone bodies, often part of diabetic ketoacidosis.
- Appearance Abnormalities
- Cloudy Appearance: Due to amorphous phosphates, which dissolve with acetic acid.
- Mucus: Appears as a flocculent cloud.
- Pus: Settles as a heavy cloud at the bottom of the container.
- Stones: as fine sand.
- Uric Acid: Appears as grains of pepper.
- Reaction (pH)
- Alkaline Reaction: Occur in cystitis. Urine should be fresh for correct pH testing, as urine can become alkaline if left standing due to ammonia formation.
- Specific Gravity Abnormalities
- Low Specific Gravity (1.001): Common in renal diseases due to the kidney’s inability to concentrate urine.
- High Specific Gravity (up to 1.060): Show diabetes mellitus due to the presence of sugar.
- Constituents of Urine
- Albumin (Albuminuria): Presence indicates kidney damage.
- Sugar (Glycosuria): Indicates diabetes mellitus when urine has sugar, exceeding the renal threshold of 140 to 180 mg per 100 ml.
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