7.3 Catheter Care, Specimen Collection & Non-Sterile Procedures

Catheter Care, Specimen Collection & Non-Sterile Procedures

In skilled nursing and long-term care facilities, Certified Nursing Assistants frequently care for residents with specialized medical devices and non-sterile diagnostic needs. Caring for residents with indwelling urinary catheters (Foley catheters), executing proper specimen collection protocols, and administering hot and cold therapeutic applications require strict adherence to medical asepsis, Standard Precautions, and resident safety guidelines.

Improper technique in catheter maintenance or specimen handling can introduce life-threatening Catheter-Associated Urinary Tract Infections (CAUTIs), invalidate laboratory diagnoses, or cause severe thermal tissue damage to fragile geriatric skin.

1. Indwelling Foley Catheter Care & CAUTI Prevention

An indwelling urinary catheter (commonly called a Foley catheter) is a flexible tube inserted through the urethra into the urinary bladder to provide continuous urine drainage. A small retention balloon inflated with sterile water (typically 5 to 10 mL) anchors the catheter tip inside the bladder neck.

+-----------------------------------------------------------------------------+
|                   ANATOMY OF INDWELLING FOLEY CATHETER SYSTEM               |
|                                                                             |
|   [BLADDER RETENTION BALLOON] ---> Inflated with 5-10 mL sterile water.     |
|   [URINARY MEATUS]            ---> Point of insertion; high infection risk. |
|   [CATHETER TUBING]           ---> Anchored with StatLock to thigh/abdomen. |
|   [GRAVITY DRAINAGE TUBING]   ---> Coiled over bed, zero dependent loops.   |
|   [URINE DRAINAGE BAG]        ---> ALWAYS BELOW BLADDER on bed frame.       |
|   [DRAIN SPOUT / CLAMP]       ---> Emptied with alcohol disinfection.       |
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The Critical Hazard of CAUTI

Urinary tract infections account for over 30% of all healthcare-associated infections (HAIs) in long-term care settings, and approximately 75% of hospital-acquired UTIs are associated with an indwelling urinary catheter. Bacteria migrate rapidly into the bladder along both the external surface of the catheter tubing (extraluminal route) and inside the tubing lumen if the closed drainage system is broken (intraluminal route).

Daily Perineal & Catheter Cleansing Protocol

[!NOTE] General practice vs. the Mississippi checklist. The four-inch downward cleansing distance below is standard nursing practice and is what you should do at the bedside. On the Mississippi Skill Test, the bolded key steps are worded differently and more simply: hold the catheter where it exits the urethra with one hand, clean with strokes only away from the urethra (at least two strokes), and do not allow the tube to be tugged or pulled at any time. Also note that Mississippi performs catheter care on a manikin, not the resident actor. Catheter hygiene must be performed at least daily during morning care, after bowel movements, and whenever the perineal area becomes soiled.

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|                     CATHETER CLEANSING TECHNIQUE                            |
|                                                                             |
|   1. Wash perineal area first (front to back).                              |
|   2. ANCHOR: Grasp catheter tubing at meatus with non-dominant hand.        |
|   3. CLEANSE: Wash DOWNWARD at least 4 INCHES away from meatus in 1 stroke. |
|   4. ROTATE: Use a clean fold of soapy washcloth for each subsequent stroke.|
|   5. RINSE & DRY: Repeat downward strokes with clean rinse cloth and towel. |
|   6. NEVER PUSH TUBING BACK TOWARD THE MEATUS OR BLADDER.                   |
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1. Preparation: Perform hand hygiene, don clean disposable gloves, identify the resident, explain the procedure, and provide complete privacy. Position a protective waterproof pad beneath the resident's buttocks.
2. Perineal Cleansing: Wash, rinse, and dry the resident's perineum first:
   • Female: Separate the labia and wash from front to back (urinary meatus toward anus) using a clean washcloth surface for each stroke.
   • Male: In uncircumcised males, gently retract the foreskin, wash in a circular motion from the meatus outward around the glans, rinse, dry, and immediately return the foreskin to its natural anatomical position to prevent paraphimosis.
3. Catheter Tubing Cleansing (Critical Step):
   • Place your non-dominant gloved fingers firmly on the catheter tubing directly where it enters the urinary meatus. This anchors the catheter and prevents painful traction or dislodgement of the retention balloon against the bladder neck.
   • Using a washcloth moistened with warm water and mild soap, wipe DOWNWARD away from the meatus along the tubing for at least 4 inches (10 cm) in a single smooth stroke.
   • Change to a fresh, clean surface of the washcloth for each subsequent stroke. Repeat until the tubing is clean.
   • Using a fresh washcloth moistened with plain warm water, rinse the tubing downward away from the meatus for 4 inches using clean cloth folds.
   • Pat the tubing and perineal area dry with a clean towel.
   • Never wipe upward toward the meatus, as this introduces perineal bacteria directly into the urethra.

2. Catheter Tubing Securement & Closed Drainage System Management

Maintaining the structural and functional integrity of the closed urinary drainage system is essential to prevent mechanical trauma, accidental extubation, and ascending microbial contamination.

+-----------------------------------------------------------------------------+
|                     CLOSED DRAINAGE SYSTEM MANAGEMENT                       |
|                                                                             |
|   [TUBING SECUREMENT]         [BAG POSITIONING]         [EMPTYING PROTOCOL] |
|   - Female: Inner thigh.      - ALWAYS BELOW BLADDER.   - Barrier under cup.|
|   - Male: Upper thigh or      - Bed frame ONLY.         - Spout NEVER       |
|     lower abdomen.            - NEVER side rails.         touches cylinder. |
|   - Leave slack for movement. - NEVER touch floor.      - Alcohol wipe spout|
+-----------------------------------------------------------------------------+

Tubing Securement Standards

Catheter tubing must be anchored securely to the resident's body using an engineered securement device (such as a StatLock adhesive anchor or commercial Velcro leg strap):

• Female Residents: Secure the tubing to the anteromedial (inner) thigh.
• Male Residents: Secure the tubing to the upper thigh or lower abdomen. Abdominal securement eliminates downward traction on the penoscrotal junction, preventing pressure necrosis, urethral strictures, and fistulas.
• Slack Requirement: Always leave sufficient slack in the tubing between the meatus and the securement device so that normal leg movement or turning does not pull on the catheter.

Rules for Drainage Bag & Tubing Positioning

1. Always Position Below Bladder Level: The drainage bag must remain below the level of the bladder at all times—whether the resident is in bed, sitting in a wheelchair, transferring, or ambulating. Placing the bag above the bladder causes colonized urine to flow backward (reflux) into the sterile bladder, triggering immediate bacterial colonization and urosepsis.
2. Attach to the Immovable Bed Frame: Fasten the drainage bag to the non-movable portion of the bed frame.
   • NEVER attach the bag to the side rails: Raising or lowering side rails can stretch the tubing, rip the inflated balloon through the bladder neck, and cause severe urethral hemorrhage.
   • NEVER allow the bag to rest on the floor: Contact with the floor contaminates the drain port with virulent environmental microorganisms.
3. Maintain Straight Gravity Drainage: Tubing must be coiled neatly on the bed and routed directly downward over the resident's thigh. Tubing must be free of kinks, twisting, or dependent sagging loops (which trap urine and halt gravity flow).

Procedure for Emptying a Urinary Drainage Bag

1. Assemble supplies: Clean gloves, paper towel barrier, graduated cylinder, and 70% isopropyl alcohol wipe.
2. Place a paper towel barrier on the floor directly beneath the drainage bag spout and set the graduated cylinder on the barrier.
3. Don clean gloves. Unclamp the drainage spout and open the valve.
4. Direct the urine stream into the center of the graduated cylinder. Ensure the drainage spout NEVER touches the sides, rim, or urine inside the graduated cylinder to maintain aseptic separation.
5. Allow the bag to drain completely. Wipe the drainage spout thoroughly with a fresh alcohol wipe.
6. Re-clamp the valve and tuck the spout securely back into its protective housing sheath.
7. Place the graduated cylinder on a flat surface on a paper barrier, measure the volume at eye level, record the output in mL, and inspect urine for color, clarity, sediment, or hematuria.

3. Specimen Collection Protocols & Diagnostic Integrity

Diagnostic laboratory tests on body fluids provide critical evidence for identifying infections, metabolic imbalances, and organ pathology. Certified Nursing Assistants collect routine urine, clean-catch urine, 24-hour urine, stool, and sputum specimens.

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|                        SPECIMEN COLLECTION MODALITIES                       |
|                                                                             |
|   [ROUTINE URINE]             [CLEAN-CATCH MIDSTREAM]   [24-HOUR TIMED URINE|
|   - Clean bedpan / hat.       - Sterile container.      - Evaluates kidneys.|
|   - Non-sterile specimen cup. - Cleanse meatus first.   - DISCARD 1st void. |
|   - No stool / toilet paper.  - Void initial, catch     - Collect all 24 hrs|
|                                 midstream 30-60 mL.     - MUST KEEP ON ICE. |
|   -----------------------------------------------------------------------   |
|   [STOOL SPECIMEN]            [SPUTUM SPECIMEN]                             |
|   - 1-2 tbsp from 2 sites.    - Deep pulmonary cough (NOT saliva).          |
|   - Clean tongue blade.       - Collect early morning upon waking.          |
|   - Fecal Occult Blood Test.  - Rinse mouth with water (no mouthwash).      |
+-----------------------------------------------------------------------------+

Detailed Analysis of Specimen Types

1. Routine Urine Specimen:

   • Used for routine urinalysis (pH, specific gravity, glucose, ketones, protein, occult blood).
   • Collection: Collected in a clean bedpan, urinal, or commode collection "hat". Pour approximately 60 to 120 mL into a clean specimen container.
   • Purity Rules: Instruct resident not to defecate or discard toilet tissue into the collection container, as feces and paper alter chemical test results.

2. Clean-Catch Midstream Urine Specimen:

   • Used for urine culture and sensitivity (C&S) testing to isolate specific bacterial pathogens causing urinary tract infections and identify effective antibiotics.
   • Perineal Cleansing:
     • Female: Separate labia. Cleanse using 3 antiseptic wipes: Wipe 1 down left side; Wipe 2 down right side; Wipe 3 down center directly over meatus (always front to back).
     • Male: Cleanse glans penis using antiseptic wipe in circular strokes starting at the urinary meatus and moving outward.
   • Midstream Collection Technique: The resident begins voiding a small stream into the toilet (to flush out normal urethral bacteria), stops or moves the sterile container into the ongoing stream to collect 30 to 60 mL of midstream urine, removes the cup, and finishes voiding in the toilet.
   • Sterility Rule: The CNA and resident must never touch the inside of the sterile specimen cup or inside of the lid.

3. 24-Hour Urine Collection (Timed Diagnostic Test):

   • Evaluates kidney filtration function (creatinine clearance, protein excretion, hormone levels).
   • Start Protocol (The First Void Discard Rule): At the designated start time (e.g., 07:00 AM), instruct the resident to void and DISCARD the entire first void. The bladder is now empty and the 24-hour clock officially begins.
   • Collection Protocol: Collect EVERY DROP of urine voided over the next 24 hours and pour it into the large designated collection jug containing preservative.
   • Temperature Control: The collection jug must be kept continuously on ice in a basin or stored in a dedicated specimen refrigerator to prevent bacterial growth and chemical degradation.
   • Completion Protocol: Exactly 24 hours later (07:00 AM the next morning), instruct the resident to void one final time and ADD this final void to the collection jug.
   • The Invalidation Rule: If any single void is accidentally discarded, poured down the toilet, or contaminated with stool/toilet paper, the entire 24-hour test is ruined and must be restarted from day one.

4. Stool (Fecal) Specimen:

   • Evaluates for gastrointestinal bleeding (Occult Blood / Guaiac), ova and parasites (O&P), or bacterial pathogens (Clostridioides difficile, Salmonella).
   • Collection: Have resident void before collecting stool to prevent urine contamination. Collect stool in a clean bedpan or commode hat.
   • Sampling: Using two clean wooden tongue blades, transfer approximately 1 to 2 tablespoons (or 20–30 mL of liquid stool) from two different areas of the stool mass—especially focusing on areas containing visible mucus, pus, or blood—into the clean specimen cup.

5. Sputum Specimen:

   • Sputum is thick mucus coughed up from the bronchi and lungs—it is NOT saliva or post-nasal drainage.
   • Used to diagnose pneumonia, tuberculosis (acid-fast bacilli), or pulmonary malignancies.
   • Timing: Collect early in the morning upon awakening, when pulmonary secretions have pooled in the lungs overnight.
   • Procedure: Have resident rinse mouth with plain water to clear food debris (do not use antiseptic mouthwash or toothpaste, which inhibits bacterial growth on culture plates). Instruct resident to take 3 deep breaths, hold, and produce a deep, forceful, rattling cough directly from the chest into the sterile specimen container. Collect at least 1 to 2 teaspoons (5 to 10 mL) of thick sputum.

4. Hot and Cold Applications (Non-Sterile Thermal Therapy)

Therapeutic heat and cold applications are non-sterile physical treatments prescribed by a physician to promote tissue healing, reduce inflammation, relieve pain, and ease muscle spasms.

+-----------------------------------------------------------------------------+
|                        HOT AND COLD THERAPY MECHANISMS                      |
|                                                                             |
|   [HEAT THERAPY (VASODILATION)]         [COLD THERAPY (VASOCONSTRICTION)]   |
|   - Dilates blood vessels (increases    - Constricts blood vessels (decreases|
|     blood flow, O2, & nutrients).         blood flow & fluid extravasation).|
|   - Relaxes tight muscle spasms.        - Reduces acute swelling & edema.   |
|   - Eases chronic joint stiffness.      - Numbs localized pain (anesthesia).|
|   - Promotes suppuration & healing.     - Slows bleeding & hematoma spread. |
+-----------------------------------------------------------------------------+

Clinical Comparison of Thermal Modalities

Core Safety Rules for Thermal Therapy

+-----------------------------------------------------------------------------+
|                     THE THREE CARDINAL THERMAL RULES                        |
|                                                                             |
|   [1. THE 20-MINUTE LIMIT]   [2. CLOTH BARRIER]        [3. 5-MINUTE CHECKS] |
|   - Never apply heat or cold - NEVER place packs       - Check resident skin|
|     for > 15-20 minutes.       directly on bare skin.    every 5 minutes.   |
|   - Prevents secondary       - Wrap in a flannel cover - Stop if blanched,  |
|     rebound phenomenon.        or towel barrier.         red, or blistering.|
+-----------------------------------------------------------------------------+

1. The 20-Minute Maximum Application Limit:
   • Hot and cold applications must never remain in place for longer than 15 to 20 minutes at a time.
   • The Rebound Phenomenon: If heat is applied for longer than 20 to 30 minutes, the body's protective mechanisms trigger secondary vasoconstriction, trapping heat and causing deep tissue burns. Conversely, if cold is applied for longer than 20 minutes, the body triggers secondary rebound vasodilation, increasing blood flow, edema, and tissue damage.
2. The Mandatory Cloth Barrier Rule:
   • NEVER apply hot or cold packs directly against bare skin. Always wrap the ice bag, hot water bottle, or chemical pack in a protective cloth cover, pillowcase, or towel barrier to prevent direct frostbite or thermal burn injury.
3. Frequent Skin Assessment (Every 5 Minutes):
   • The CNA must remove the application and inspect the resident's skin every 5 minutes throughout the treatment.
   • Signs to Terminate Therapy Immediately:
     • Heat: Extreme erythema (redness), blistering, resident complaints of burning or throbbing pain.
     • Cold: Extreme pallor (blanching), cyanosis, mottling, severe shivering, or numbness.
   • If any adverse sign appears, stop the treatment immediately, remove the pack, and notify the charge nurse.
4. High-Risk Populations: Frail elderly residents, individuals with diabetic peripheral neuropathy (diminished thermal sensation), paralyzed extremities, cognitive impairment, or peripheral vascular disease are at extreme risk of severe burns or frostbite.

5. Comprehensive Summary & Skill Reference Table