The pH reading should be between 1-5.5. However, if you obtain a result of between 5-6 do not administer anything down the nasogastric tube. You must telephone your nurse or managing healthcare professional for further advice because the aspirate reading will need to be reconfirmed.
What pH is safe for NG feeding?
Objectives The existing British National Patient Safety Agency (NPSA) safety guideline recommends testing the pH of nasogastric (NG) tube aspirates. Feeding is considered safe if a pH of 5.5 or lower has been observed; otherwise chest X-rays are recommended.
What is normal drainage from a nasogastric tube?
Normal color of gastric drainage is light yellow to green in color due to the presence of bile. Bloody drainage may be expected after gastric surgery but must be monitored closely. Presence of coffee-ground type drainage may be indicate bleeding. 3 Inspect suction apparatus.
How do you know if NG tube is in pH of lungs?
- Attach an empty syringe to the NG tube and gently flush with air to clear the tube. Then pull back on the plunger to withdraw stomach contents.
- Empty the stomach contents on to all three squares on the pH testing paper and compare the colors with the label on the container.
Which pH results means the NG is most likely in the wrong place?
False positive readings may occur if the nasogastric tube is misplaced in the oesophagus or false negative readings (pH >5.5) may occur in patients who receive antacid medications, which can delay feeding while waiting for the second-line test, a chest X-ray.
How do you check gastric pH?
This involves aspiration of gastric fluid by syringe and testing the aspirate for acidity using a pH strip. Various cut-points have been adopted to confirm if the tube is correctly placed in the stomach or if it is unclear where the tube is placed.
What does a gastric pH of 6 mean?
A pH of less than 5.5 would indicate gastric placement, while a pH of 6 or above may indicate bronchial secretions and possible incorrect tube placement in the bronchial tree (National Patient Safety Agency, 2005)
Why do you aspirate NG tube?
A nasogastric tube is a narrow-bore tube passed into the stomach via the nose. It is used for short- or medium-term nutritional support, and also for aspiration of stomach contents – eg, for decompression of intestinal obstruction.How do you know if an NG tube is properly placed?
- The chest X-ray viewing field should include the upper oesophagus and extend to below the diaphragm.
- The NG tube should remain in the midline down to the level of the diaphragm.
- The NG tube should bisect the carina.
Nasogastric tubes are typically used for decompression of the stomach in the setting of intestinal obstruction or ileus, but can also be used to administer nutrition or medication to patients who are unable to tolerate oral intake.
Article first time published onWhat is a normal NG output?
On average, the nasogastric tube was maintained for 3.2 +/- 2.1 days (range 1-8) after surgery. The average daily nasogastric output was 440 +/- 283 mL (range 68-1565).
What pH value should the nurse expect when confirming placement of the NG tube using the pH method?
It is important to check the nasogastric tube position prior to administering anything via the feeding tube, after a coughing fit or vomiting episode. ➐ Never administer anything down the tube and do not start feeding before confirmation of pH. The pH reading should be between 1-5.5.
How much residual is too much for NG tube?
If the gastric residual is more than 200 ml, delay the feeding. Wait 30 – 60 minutes and do the residual check again. If the residuals continue to be high (more than 200 ml) and feeding cannot be given, call your healthcare provider for instructions.
What does a gastric pH of 4 or lower indicate?
A pH of 4 has been defined as a threshold below which refluxed gastric contents become injurious to the oesophagus.
What should the pH be for respiratory or small intestine secretions?
The pH of gastric aspirate is acidic (1 to 5), the pH of intestinal aspirate is approximately 6 or more, and the pH of respiratory aspirate is more alkaline (7 or more). Using the pH method is most effective in distinguishing between gastric and intestinal placement.
What pH values are basic?
As this diagram shows, pH ranges from 0 to 14, with 7 being neutral. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic).
What would a pH of 6 or higher indicate for NG tube?
A pH of 1 to 5 generally indicates gastric contents; 6 or greater may indicate intestinal placement. Fluid from the respiratory tract typically has a pH greater than 7.
Why does the pH of the stomach have to be 2?
The stomach usually has a pH of 2 or 3. The stomach is protected by having a layer of mucus between the inside the stomach and the actual stomach tissue. Some of the cells that line the stomach also make a buffer (a high-pH liquid) that helps to keep the pH right by the cells closer to neutral.
What can alter gastric pH?
The histamine receptor antagonists cimetidine, ranitidine, famotidine, and nizatidine reduce gastric acid secretion via competitive antagonism of the histamine receptor, thereby increasing gastric fluid pH.
What is a whoosh test?
The whoosh test is undertaken by rapidly injecting air down an NGT while auscultating over the epigastrium. Gurgling is indicative of air entering the stomach, whilst its absence suggests the tip of the NGT is elsewhere (lung, oesophagus, pharynx, and so on).
What is the pH of respiratory secretions?
Respiratory secretions typically have a pH of 6 or greater.
How do you decompress your stomach with an NG tube?
Insert the tube into an unobstructed nostril and slowly advance until at predetermined length. Check tube placement before evacuation by air insufflation into the stomach with a large syringe. Attach suction or a large syringe and evacuate the stomach.
What is the blue thing at the end of an NG tube?
An anti-reflux valve is attached to the blue pigtail to prevent gastric contents from seeping out.
How often should NG tube be changed?
Long term NG and NJ tubes should usually be changed every 4–6 weeks swapping them to the other nostril (grade C).
Which of the following pH levels should the nurse identify as an indication of correct placement of the tube?
Testing the pH of gastric aspirate to show pH ≤5.5 is recommended first-line test to confirm correct placement of nasogastric tubes and reduce the risk of potentially fatal aspiration.
How often do you flush a feeding tube?
Most tubes need to be flushed at least daily with some water to keep them from clogging — even tubes that are not used. You should be given a large syringe for this. Please flush with 30 – 60 mls (1 – 2 ounces) of tap water for this purpose.
What is a high gastric residual?
Residual refers to the amount of fluid/contents that are in the stomach. Excess residual volume may indicate an obstruction or some other problem that must be corrected before tube feeding can be continued.
What is the most common problem in tube feeding?
Diarrhea. The most common reported complication of tube feeding is diarrhea, defined as stool weight > 200 mL per 24 hours.
What do the pH readings of gastric aspirate mean?
Measuring the pH of gastric aspirate is considered the ‘gold standard’ in routine confirmation of NG tube placement prior to use. Typically, a pH of <6 would indicate an NG tube is in the stomach. See this previous Connected Care QuickHit for best practice for confirming placement of NG tubes.
