Lab Dept:

Other Fluids

Test Name:

PH FLUID BY METER

General Information

Lab Order Codes:

FPH

Synonyms:

Body Fluid pH

CPT Codes:

83986 – pH, body fluid, except blood

Test Includes:

pH reading from Orion meter.

Logistics

Test Indications:

The pH of gastric, pleural, peritoneal and synovial fluids can guide in the diagnosis and treatment of ruptures or septic inflammation.

Lab Testing Sections:

Chemistry (all specimens tested on the St. Paul campus)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

4 hours

Special Instructions:

Send to lab within 30 minutes of collection. See Sample Rejection.

Specimen

Specimen Type:

Fluid, aqueous

Container:

Screw capped, sterile vial or plastic syringe, capped or Green (Li Heparin) tube

Draw Volume:

2 mL fluid

Processed Volume:

2 mL preferred (Minimum: 1.5 mL) fluid

Collection:

Collect in clean, sterile container

Special Processing:

Deliver to laboratory immediately, pH will change with time. Specimens must be tested within 4 hours of collection.

Mpls Staff: Immediately centrifuge specimen to remove cellular material and transport at 4 – 8ºC to St. Paul lab via courier.

Patient Preparation:

None

Sample Rejection:

Clotted specimen; specimens more than 4 hours old; highly cellular specimens; mislabeled or unlabeled specimens

Interpretive

Reference Range:

<7.3 is suggestive of exudates.

= or >7.3 is found in transudates.

Gastric Aspirates: 1.5 – 3.5

Critical Values:

N/A

Limitations:

N/A

Methodology:

Orion pH Meter

References:

Tietz, Norbert (1995) Clincial Guide to Laboratory Tests, 3rd edition, WB Saunders Co, pp 258-261

Jacobs and DeMott Laboratory Test Handbook (2001) 5th Edition, Lexi-comp Inc.

Update:

7/1/2004: Method changed from pH Testr 3to Orion pH Meter. Note minimum volume differences between campuses.
8/28/2005: Draw volume previously listed as 5.0 mL.
3/24/2008: Minimum volume increased to 1.5 mL due to new equipment requirements. Previously listed as 0.5 mL.
3/6/2012: Reference ranges updated.