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22243 Bicarbonate, Random Urine

Bicarbonate, Random Urine
Test Code: MISC
Synonyms/Keywords
HCO3 in Urine, CO2 in Urine, Urine bicarbonate​
Useful For
Urine bicarbonate may be useful in patients with renal tubular acidosis.  These patients are unable to adequately acidify their urine and tend to have a high urine pH in the 6-7 range with serum bicarbonate levels at the lower limit of normal or slightly acidotic (15-20 mmol/L range).  ​
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​ Urine​ Random Urine collected in a Syringe​ RUA tube eliminating all dead air space​ 10 mL​ 1 mL ​ ​
Collection Processing Instructions

Please call the 24 Hour Lab (ext. 16363) prior to the collection so that they can schedule the performance of this procedure.
10 mL random urine collected and received in the lab in an anaerobic state. To accomplish an anaerobic state, nursing staff should obtain the sample with a syringe from a Foley catheter (no air bubbles) or collect the sample in a cup containing mineral oil (then immediately transfer the specimen to a urine tek tube maintaining the mineral oil top layer).​

Specimen Stability Information
Specimen Type Temperature Time
Urine​ ​ Analyze within 3 hours of collection​
Rejection Criteria
 Specimens received in an aerobic state
 Specimens with a pH <6.0 ​
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday​ Less than 2 hours​ Blood Gas Analyzer​
Reference Range Information
Performing Location Reference Range
Marshfield​ Reference ranges are not established​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82374   ​ ​ ​ ​ ​
Synonyms/Keywords
HCO3 in Urine, CO2 in Urine, Urine bicarbonate​
Ordering Applications
Ordering Application Description
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
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​ Urine​ Random Urine collected in a Syringe​ RUA tube eliminating all dead air space​ 10 mL​ 1 mL ​ ​
Collection Processing

Please call the 24 Hour Lab (ext. 16363) prior to the collection so that they can schedule the performance of this procedure.
10 mL random urine collected and received in the lab in an anaerobic state. To accomplish an anaerobic state, nursing staff should obtain the sample with a syringe from a Foley catheter (no air bubbles) or collect the sample in a cup containing mineral oil (then immediately transfer the specimen to a urine tek tube maintaining the mineral oil top layer).​

Specimen Stability Information
Specimen Type Temperature Time
Urine​ ​ Analyze within 3 hours of collection​
Rejection Criteria
 Specimens received in an aerobic state
 Specimens with a pH <6.0 ​
Useful For
Urine bicarbonate may be useful in patients with renal tubular acidosis.  These patients are unable to adequately acidify their urine and tend to have a high urine pH in the 6-7 range with serum bicarbonate levels at the lower limit of normal or slightly acidotic (15-20 mmol/L range).  ​
Reference Range Information
Performing Location Reference Range
Marshfield​ Reference ranges are not established​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday​ Less than 2 hours​ Blood Gas Analyzer​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82374   ​ ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.