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Test Code RTXGAS Blood Gases, Mixed Venous

Specimen and Container/Tube

Blood, Mixed Venous

Turnaround Time

15 minutes

Specimen Type

Blood, Mixed Venous

UCMC Collection Instructions

  • Remove air.
  • Remove needle from syringe.
  • Cap tightly and mix well. Mix horizontally for 15 seconds
  • No ice.
  • Route the specimen and requisition to the Rapid
    Response
    Lab tube station 196 or hand deliver to Rapid Response Lab room
    TW005

STAT Turnaround Time

15 minutes

Critical Results

pH: <7.20 or >7.60

PCO2: <20 or >70 mmHg

Hemoglobin: <6.0 g/dL

Carboxyhemoglobin: >20%

Methemoglobin: >10%

Fee Code

24245

Container/Tube

Balanced heparinized syringe

Specimen Minimum Volume

0.5 mL

Day(s) Performed

24/7

STAT DAY(S) AND TIME(S) PERFORMED

Available

CPT

82805

Method Name

Potentiometry: pH, pCO2

Amperometry: pO2

Derived: HCO3-, base excess

Optical (CO-oximetry): SO2, hemoglobin, oxyhemoglobin, deoxyhemoglobin, carboxyhemoglobin, methemoglobin

Reference Values

pH: 7.33-7.43

PCO2: 41-51 mmHg

PO2: 35-50 mmHg

HCO3-: 22-29
mmol/L

Base Excess: -3-+3

SO2: 70-76%

Hemoglobin: 12.0-18.0
g/dL

Oxyhemoglobin:
67-75%

Deoxyhemoglobin:
24-29%

Carboxyhemoglobin:<
3.0%

Methemoglobin: <2.0%

Additional Information

For SO2: “Measured oxygen saturation of functional hemoglobin
according to the following formula. OxyHb/(OxyHb + DeoxyHb).”

For OxyHb: “Measured oxygen saturation of total hemoglobin
according to the following formula. OxyHb/(OxyHb + DeoxyHb + COHb +
MetHb).”

Pediatric Volume

0.5 mL

Methodology

Potentiometry: pH,
pCO2

Amperometry: pO2

Derived: HCO3-, base
excess

Optical (CO-oximetry):
SO2, hemoglobin, oxyhemoglobin, deoxyhemoglobin, carboxyhemoglobin,
methemoglobin