Nasogastric Tube (NG Tube): What Hong Kong Caregivers Need to Know

A nasogastric tube (NG tube) is a soft tube inserted through the nostril, passing through the throat and oesophagus into the stomach. It is used to deliver nutrition, medication, or both to patients who cannot eat by mouth. In Hong Kong public hospitals, NG tube feeding is the most common enteral nutrition method for patients with acute dysphagia.

For caregivers, continuing NG tube feeding at home after discharge can feel unfamiliar and daunting. This guide provides practical NG tube care information for Hong Kong home caregivers, covering daily hygiene management, tube position verification, common problems and emergency sign recognition.

Important: This guide provides general information and does not replace individualised guidance from healthcare professionals. Before beginning home tube feeding, ensure you have received hands-on training from a hospital nurse or speech-language pathologist. If you have any doubt about tube position, do not instil any food or liquid.

Daily Care: Core Hygiene Principles

Before Each Feeding

1. Wash hands — scrub thoroughly with soap and water for at least 20 seconds, or use alcohol-based hand rub.
2. Confirm tube position — verify the tube is correctly placed in the stomach before every feed (see below).
3. Check tube patency — flush with 30 ml of tepid water and confirm flow is unobstructed.
4. Position the patient — the patient should be elevated to at least 30–45° or fully upright to reduce reflux and aspiration risk.

During the Feed

• Use gravity drip (hanging bag) or slow syringe bolus; never push rapidly.
• Feeding rate is typically 100–200 ml per hour (exact rate specified by your healthcare team).
• Monitor continuously for coughing, retching or breathing difficulty during the feed.

After Each Feeding

1. Flush with 30–50 ml of tepid water to prevent blockage and bacterial growth.
2. Cap or clamp the tube end.
3. Keep the patient upright for at least 30 minutes after the feed.
4. Record feed volume, time and patient response.

Oral Care

Even when the patient takes nothing by mouth, daily oral hygiene is essential:

• Brush teeth at least twice daily with a soft toothbrush and a small amount of toothpaste (if the patient is conscious and can control swallowing).
• For patients unable to brush, use oral care swabs moistened with water to clean the mucosa, gums and tongue.
• Adequate oral hygiene reduces the risk of aspiration pneumonia.

Confirming Tube Position: Methods Usable at Home

Tube displacement is one of the most serious safety risks of home tube feeding. Position must be confirmed before every feed.

Method 1: pH Indicator Paper Test (Preferred)

1. Use a syringe to aspirate 1–2 ml of fluid from the tube.
2. Drop the fluid onto pH indicator paper and observe the colour change.
3. Gastric fluid is typically pH 1–5 (strongly acidic); pH ≤ 5 suggests correct gastric placement.
4. pH > 6 suggests the tube may not be in the stomach — do not feed; contact your healthcare team immediately.

Note: Patients taking acid-suppressing medications (e.g. proton pump inhibitors) may have higher gastric pH (5–6). Ask the healthcare team at discharge for the patient’s baseline pH range.

Method 2: Observing External Tube Length

At insertion, the healthcare team typically records the visible external tube length (cm marking at the nostril). Check this length before every feed — a significant increase or decrease suggests possible displacement.

Hospital-Only Confirmation Methods

• X-ray confirmation: the most reliable method, but not feasible at home.
• Auscultation (air injection and listening): no longer considered reliable — Hospital Authority guidelines do not recommend it as a standalone method.

Common Problems and Solutions

Tube Blockage

Signs: Increased resistance when flushing, inability to aspirate fluid.

Management:

1. Try flushing with 30 ml of tepid water using a gentle push-pull motion.
2. If unsuccessful, you may try cola or warm water left in the tube for 15–30 minutes before re-flushing (consult your healthcare team before attempting this).
3. If still blocked, do not force flush — contact your healthcare team or attend an A&E to assess whether the tube needs replacing.

Prevention:

• Flush with water after every feed and after every medication dose.
• When giving medications, crush tablets and dissolve in warm water before instilling (confirm every medication can be crushed — some modified-release tablets must not be).

Nasal Pressure Injury

Prolonged NG tube use can cause pressure injuries at the nostril or upper lip.

Care:

• Change the fixation tape daily; clean the nasal area before re-securing.
• Alternate nostrils periodically (requires tube replacement by a healthcare professional).
• Report redness, skin breakdown or pain to your community nurse or healthcare team.

Patient Self-Extubation

Patients with cognitive impairment may pull out their NG tube.

Management:

• Do not attempt to reinsert the tube yourself.
• Contact your GP, community nurse or A&E immediately for professional reinsertion.
• If self-extubation is frequent, discuss with the medical team whether protective mitts are appropriate, or whether a longer-term feeding option (e.g. PEG tube) should be evaluated.

Warning Signs of Tube Displacement

The following indicate the NG tube may have moved out of position. Stop feeding immediately and contact your healthcare team:

• Persistent coughing or choking during or after feeding
• Breathing difficulty or rapid breathing
• Visible change in the external tube length
• Aspirated fluid pH > 6 (adjust interpretation for patients on acid-suppressants)
• Patient reports a sensation of tube movement or unusual discomfort
• Tube visibly loosened from the nostril

Emergency situations (call 999):

• Patient turns blue, loses consciousness or stops breathing
• Suspected large-volume aspiration of feed into the airway

Hong Kong Hospital Authority (HA) Referral Pathways

Community Nursing Outreach

Patients discharged with an NG tube can typically be referred to community nursing services by the hospital:

• HA Community Nursing Service: Arranged by the ward nurse or social worker at discharge; nurses visit regularly for tube changes and assessment.
• General Outpatient Clinic (GOPC) Nursing Clinics: Some hospital clusters have dedicated enteral feeding nursing clinics.
• Private GP: Can provide tube replacement referrals or community nurse service referrals.

NG Tube Replacement at Public Hospitals

NG tubes typically require replacement every 4–6 weeks (exact timing depends on hospital guidelines and tube type). Options include:

1. Attend the outpatient clinic or A&E of the originating hospital.
2. Community nurse home visit replacement (requires advance appointment).

Long-Term Feeding Assessment: PEG Tube

If the patient is expected to require tube feeding for more than 4–6 weeks, the medical team may recommend a PEG tube assessment. PEG tubes are placed endoscopically in the procedure room and are more convenient for long-term home use than NG tubes. Ask your attending physician whether referral for PEG assessment is appropriate.

Private Care Options in Hong Kong

For families who do not qualify for public community nursing or wish to supplement public services, private options include:

• Private nursing home visit services: Tube replacement, feeding technique coaching, wound care. Approximate cost: HKD $400–$800 per visit depending on scope.
• Private nursing homes or care homes: For patients requiring round-the-clock tube feeding support.
• Hong Kong Speech and Language Therapists Association (HKSLTA): Provides a directory of private SLPs who can assess post-NG tube swallowing function and guide transition to oral feeding.

Caregiver Support

Managing long-term home tube feeding places significant physical and psychological demands on caregivers. Support resources include:

• Hong Kong Council of Social Service (HKCSS): Carer information and support services.
• Caritas Caregiver Support Services: Training and support groups.
• Family doctor: If caregiver burnout or anxiety symptoms emerge, referral to social work or counselling services is available.

Caregiver wellbeing is an integral part of patient safety.