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22853 Reducing Substance - Stool

Reducing Substance - Stool
Test Code: RED
Useful For
Detection of reducing substances in stool
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)​​
​Random Stool ​Clean Sage cup ​Clean container Carey-Blair ​2 grams ​1 gram or 1 mL of liquid ​1 gram or 1 mL of liquid
Specimen Stability Information
Specimen Type Temperature Tim​​e
Stool​ ​ ​Refrigerate ​72 hours
​Frozen ​> 72 hours
Rejection Criteria
Feces from a 24 hr or 72 hr collection
Interference
Salicylates, penicillin, ascorbic acid, nalidixic, cephalosporin and probenecidin in large quantities.
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrume​​ntation
​Marshfield ​Monday through Friday (days only) ​1 hour ​Spot test using Clinitest tablets
Reference Range Information
Performing Location Reference R​​ange
​Marshfield ​Negative - 1/4 %
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Com​​ments
84376​ ​ ​ ​ ​
Ordering Applications
Ordering Application Descrip​​tion
​Centricity ​Reducing Substance - Stool
​Clinical Order Manager ​Reducing Substance - Stool
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)​​
​Random Stool ​Clean Sage cup ​Clean container Carey-Blair ​2 grams ​1 gram or 1 mL of liquid ​1 gram or 1 mL of liquid
Specimen Stability Information
Specimen Type Temperature Tim​​e
Stool​ ​ ​Refrigerate ​72 hours
​Frozen ​> 72 hours
Rejection Criteria
Feces from a 24 hr or 72 hr collection
Interference
Salicylates, penicillin, ascorbic acid, nalidixic, cephalosporin and probenecidin in large quantities.
Useful For
Detection of reducing substances in stool
Reference Range Information
Performing Location Reference R​​ange
​Marshfield ​Negative - 1/4 %
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrume​​ntation
​Marshfield ​Monday through Friday (days only) ​1 hour ​Spot test using Clinitest tablets

​Marshfield Labs
1000 North Oak Avenue
Marshfield, WI 54449-5795

Laboratory Reference Services

  • Marshfield Labs Customer Service
    • Toll-free: 800-222-5835
    • Direct Dial: 715-221-6700
    • Internal: ext. 16700
    • Fax: 715-221-6215
    • Email: mlcussev@marshfieldclinic.org
    • Web Portal Helpline (technical support):866-522-2611

Billing Questions

  • Marshfield Center Patient Assistance Center (PAC)
    • Fee estimates, assistance with available government programs (e.g Badger Care): 800-782-8581 ext. 94475
    • Insurance eligibility, insurance referrals, managed care requirements that include Preadmission Review (PAR): 800-782-8581 ext. 75559
  • Patient Financial Services (PFS)
    • Marshfield Center: Billing statements(questions/concerns): 800-782-8581 ext. 90700
    • Marshfield Labs Billing Department: Billing statements, insurance eligibility/contracts, fee estimates (Non-Sendouts), credit card payments: 800-782-8581 ext. 90616
    • St. Joseph's Hospital of Marshfield (a Ministry affiliate): Internal ext. 77164
For sites other than Marshfield Center, please contact your local PAC (e.g. Diagnostic &Treatment Center, Flambeau Hospital, Lakeview Medical Center)

Toxicology Services

  • Toll-free: 800-331-3734
  • Direct Dial: 715-389-3734
  • Fax: 715-389-3737
  • Billing questions: 715-389-0616
  • Customer Service Email: forensic.toxicology@marshfieldclinic.org
  • Web Portal Helpline (technical support): 866-522-2611

For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Com​​ments
84376​ ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual. Sun Mar 16 2025 04:07:11 GMT+0000 (Coordinated Universal Time)