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Accreditation Certificates

2026 CAP Certificate

Critical Value Information

Critical Values Policy

General Information

Clinical Requisition Form

Microbiology Requisition Form

Cytology Requisition Form

Pathology Requisition Form

Specimen Transport Pictoral

Marshfield Labs Website

Direct Access Links

Direct Access Information

Mayo Clinic Laboratories

Test Code PH-BF pH, Body Fluid

Important Note

For internal ordering only. Not available to outreach clients.

Specimen Requirements

Fasting Required	Specimen Type	Preferred Container/Tube	Acceptable Container/Tube	Specimen Volume	Specimen Minimum Volume (allows for 1 repeat)	Pediatric Minimum Volume (no repeat)
No	Body Fluid	Syringe	Red Top (RTT), Lithium or Sodium-heparin Green Top (GTT)	3 mL	0.3 mL

Collection/Processing Instructions

Body fluid specimen should be collected in an air-tight syringe.

Remove all air bubbles from fluid in syringe immediately after collection.

Remove the needle before transporting the sample to the laboratory.

Alternate specimens: Full 3 mL green or 7 mL red.

Place specimen on cold pack or wet ice and deliver to the laboratory immediately.

Specify source and/or type of body fluid as a test comment.

Specimen Stability Information

Specimen Type	Time	Temperature
Body Fluid	20 minutes	Room Temperature
Body Fluid	45 minutes	Refrigerated or on ice

Rejection Criteria

Specimens that are more than 30 minutes old at room temperature

Reference Range Information

Performing Location	Reference Range
All Performing Sites	Not available

Marshfield Labs Performing Department

Marshfield Labs Urinalysis

Performing Information

Performing Location	Day(s) Test Performed	Analytical Time	Methodology/Instrumentation
Beaver Dam	Monday through Sunday	Less than 2 hours	Gem 5000
Weston	Monday through Sunday	Less than 2 hours	Radiometer
Eau Claire	Monday through Sunday	Less than 2 hours	Reference Electrode/Orion Starr 211
Park Falls	Monday through Sunday	Less than 2 hours	Reference Electrode/Gem 4000
Rice Lake	Monday through Sunday	Less than 2 hours	Reference Electrode/Gem 4000
Marshfield	Monday through Sunday	Less than 2 hours	Reference Electrode/Gem 4000
Minocqua	Monday through Sunday	Less than 2 hours	Reference Electrode/Gem 4000

CPT Codes

CPT	Modifier (if needed)	Quantity	Description	Comments
83986

Ordering Applications

Ordering Application	Description
Cerner	pH Body Fluid