Indicating the presence of infections or fistulas
Verifying the effectiveness of treatment to reduce stomach pH
Diagnosing disease states characterized by abnormal stomach acidity
This test is not appropriate for measurement of pleural fluid pH as that measurement should be made using a blood gas analyzer locally due to sample stability and transport requirements.
pH Meter
Body Fluid pH
Body Fluid
1. Date and time of collection.
2. Specimen source
-Preferred: Identify source name from the following list with location (if appropriate):
-Peritoneal fluid (peritoneal, abdominal, ascites, paracentesis)
-Drain fluid (drainage, JP drain)
-Synovial fluid
-Write in source name with source location (if appropriate)
-Unacceptable: Spinal fluid (CSF), chest (thoracic) fluid, thoracentesis, pleural fluid, and urine
Question ID | Description | Answers |
---|---|---|
SRC18 | Source |
Abdominal Ascites Gastric Lavage Paracentesis Parenteral Pericardial Peritoneal Pancreatic Cyst Fluid |
Supplies: Metal Free Specimen Vial (T173)
Container/Tube: Metal-free container
Specimen Volume: 5 mL
1 mL
Spinal, chest (thoracic) fluid, thoracentesis, or pleural fluid Urine | Reject |
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
Body Fluid | Refrigerated (preferred) | 7 days | |
Frozen | 7 days | ||
Ambient | 24 hours |
Indicating the presence of infections or fistulas
Verifying the effectiveness of treatment to reduce stomach pH
Diagnosing disease states characterized by abnormal stomach acidity
This test is not appropriate for measurement of pleural fluid pH as that measurement should be made using a blood gas analyzer locally due to sample stability and transport requirements.
The pH value is a measure of hydrogen ion concentration. Increased metabolic activity and production of acidic byproducts (eg, lactic acid) due to infection is known to decrease pH. A variety of disease processes can alter pH values; therefore, low pH has reduced specificity. Gastric content typically has a low pH, and measurement of pH has been used to help identify gastric fluid. Determining the pH value of a body fluid may help characterize the nature of the fluid.
An interpretive report will be provided.
Normal gastric fluid has a pH below 3.0; any higher pH is abnormal.
Low peritoneal fluid pH (<7.35) may be observed in spontaneous bacterial peritonitis.(1)
Specimens should be collected, maintained anaerobically, and tested as soon after collection as possible as exposure to air and time causes pH to increase as carbon dioxide is lost from the sample.
The pH meter is composed of a glass electrode, calomel electrode and voltmeter. The glass electrode has a fixed acid concentration, yielding a corresponding voltage. The calomel electrode is the reference electrode. Its voltage is independent of the H+ ion concentration. The two electrodes constitute a galvanic cell whose electromotive force is measured by the voltmeter. The meter is calibrated to read in pH units, reflecting the H+ ion concentration. The meter is used to determine pH in 0 to 14 range.(Instruction manual: Fisher Scientific accumet Basic (AB) Benchtop Meters. Fisher Scientific; 07/2018)
Monday through Sunday
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.
83986
Test Id | Test Order Name | Order LOINC Value |
---|---|---|
UPHB | pH, BF | 2748-2 |
Result Id | Test Result Name |
Result LOINC Value
Applies only to results expressed in units of measure originally reported by the performing laboratory. These values do not apply to results that are converted to other units of measure.
|
---|---|---|
U_PHB | pH, BF | 2748-2 |
SRC18 | Source | 14725-6 |
CMT36 | Comment | 48767-8 |