Sign in →

Test Code FPH pH, Body Fluid, LAB110


Potentiometric sensor /pH Indicator Strip

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Heparinized syringe containing fluid (Pleural, Peritoneal, Blood)-Anaerobic collection

Acceptable: Dark Green Heparinized tube containing fluid (Pleural, Peritoneal, Blood)

                      Unheparinized CSF collection tube with fluid (CSF)

                      Unheparinized fluids

Specimen Volume: 135 uL of heparinized fluid

Stability: Samples should be placed in ice water if they can not be run within 30 min.

Collection Instructions: Specimen must be kept as anaerobic as possible.

                        Unheparinized fluids may be centrifuged and run on automated analyzer if no

                        microclots are present.Otherwise, the PH will be obtained from Indicator Strips.
Note: Indicate specimen source on specimen container and in computer.

           Nonanaerobic specimens can cause a falsely elevated PH result. Pleural fluids can not

           be exposed to air or the results will be invalid.

Reference Values

No established reference values

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


Useful For

A fluid pH can be helpful in the diagnosis of emphysema, malignant disorders, collagen disease, tuberculosis, esophageal rupture or hemothorax with pleural fluid, spontaneous bacterial peritonitis with peritoneal fluid, and subarachnoid hemorrhage, head injury, cerebral infarction, and purulent meningitis with CSF.