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Blood gas,mixed venous(West Roxbury)
Test CodeBLOOD GAS,MIXED(WX)
Alias/See Also
Chemistry
Preferred Specimen
Mixed venous blood in syringe ROOM TEMPERATURE
Instructions
Must deliver to Lab at Room Temperature within 30 minutes of draw.
Transport Container
Must deliver to lab at room temperature within 30 minutes of draw. DO NOT put on ice!
Transport Temperature
Room temperature
Methodology
Electrochemically (pH, pCO2, pO2 electrodes)
Setup Schedule
Daily
Report Available
TAT 1 day
Reference Range
| Test | Unit | Reference Range | Reportable | ||
| Arterial | Venous | Mixed | Range | ||
| Sodium | mmol/L | 136-145 | 100-180 | ||
| Potassium | mmol/L | 3.5 –5.1 | 1-10.1 | ||
| Chloride | mmol/L | 98-107 | 72-158 | ||
| Glucose | mg/dL | 65-95 | 18-685 | ||
| Ionized calcium | mg/dL | 4.60-5.32 |
4.64-5.32 |
1.1-13.12 | |
| Lactic Acid | Mmol/L | 0.36-0.75 | 0.56-1.39 | 0.3-17 | |
| PH | pH | 7.35-7.45 | 7.32-7.43 | 7.32-7.43 | 6.80-7.92 |
| PCO2 | mmHg | Male: 35-48 Female: 32-35 |
Male: 41-52 Female: 38-41 |
36-52 | 18-126 |
| PO2 | mmHg | 83-108 | 42-501 | ||
| HCO3* | mmol/L | 21-28 | 22-29 | 22-29 | |
| BE* | mmol/L | (-2) - (+3) | (-2) - (+3) | (-2) - (+3) | |
| Anion Gap* | mmol/L | 10-20 | |||
| O2 SAT* | % | 94.0-98.0 | |||
| COHb | % | < 3.0 (nonsmoker) < 10.0 (smoker) |
< 3.0 (nonsmoker) < 10.0 (smoker) |
< 3.0 (nonsmoker) < 10.0 (smoker) |
0.3-75 |
| MetHb | % | 0.0-1.5 | 0.0-1.5 | 0.0-1.5 | 0.7-30 |
Critical values.
| Analyte | Results | |
| SODIUM,ARTERIAL | < 120 | > 160 |
| POTASSIUM,ARTERIAL | < 2.8 | > 6.0 |
| CHLORIDE,ARTERIAL | < 60 | > 150 |
| CALCIUM, ION. VENOUS | < 3.0 | > 6.5 |
| CALCIUM, ION. ARTER | < 3.0 | >6.5 |
| GLUCOSE, ARTERIAL | 50 | 500 |
Clinical Significance
pH: The notation of pH expresses the hydrogen ion activity in a solution as the negative logarithm of the hydrogen ion concentration. Hydrogen ion activity reflects the acid-base balance within blood. The lungs, kidneys, and blood work to maintain the acid-base balance with the narrow limits required for normal cell function. pH is clinically significant as a means of determining acid-base disorders that can be caused by several pathologic conditions, such as ventilatory dysfunction and renal or gastrointestinal inadequacy.
pCO2: The measurement of the partial pressure of carbon dioxide, pCO2, is essential in determining ventilatory status. Because the lungs are primarily responsible for controlling pCO2 levels through excretion of CO2, changes in pCO2 reflect respiratory status. pCO2 and pH together provide a more definitive diagnostic tool in assessing respiratory function and in the differentiation of acid-base disorders.
pO2: pO2 is a measurement tool to evaluate the efficacy of pulmonary gas exchange. The measurement of pO2 is siginificant in evaluating the degree of hypoxemia (a deficiency of oxygen in arterial blood) present in a patient sample.
Bicarb: Bicarbonate levels are clinically significant in helping to determine the nonrespiratory, renal (metabolic) component in acid-base blood disorders.
O2 sat: Oxygen saturation is a ratio, expressed as a percentage, of the volume of oxygen carried to the maximum volume of oxygen that the hemoglobin can carry. When combined with knowledge of oxygen content, oxygen saturation is useful for evaluating the amount of oxygen actually available for the tissues. It can also be used to evaluate the effectiveness of oxygen therapy.
Base excess: permits the estimation of the number of equivalents of sodium bicarbonate or of ammonium chloride required to correct the blood pH to normal. A negative value for base excess indicates a base deficit.
pCO2: The measurement of the partial pressure of carbon dioxide, pCO2, is essential in determining ventilatory status. Because the lungs are primarily responsible for controlling pCO2 levels through excretion of CO2, changes in pCO2 reflect respiratory status. pCO2 and pH together provide a more definitive diagnostic tool in assessing respiratory function and in the differentiation of acid-base disorders.
pO2: pO2 is a measurement tool to evaluate the efficacy of pulmonary gas exchange. The measurement of pO2 is siginificant in evaluating the degree of hypoxemia (a deficiency of oxygen in arterial blood) present in a patient sample.
Bicarb: Bicarbonate levels are clinically significant in helping to determine the nonrespiratory, renal (metabolic) component in acid-base blood disorders.
O2 sat: Oxygen saturation is a ratio, expressed as a percentage, of the volume of oxygen carried to the maximum volume of oxygen that the hemoglobin can carry. When combined with knowledge of oxygen content, oxygen saturation is useful for evaluating the amount of oxygen actually available for the tissues. It can also be used to evaluate the effectiveness of oxygen therapy.
Base excess: permits the estimation of the number of equivalents of sodium bicarbonate or of ammonium chloride required to correct the blood pH to normal. A negative value for base excess indicates a base deficit.
Performing Laboratory
Test performed at West Roxbury Chemistry Lab
Contact: Jonathan Dryjowicz-Burek 857-203-5973
Last Updated: April 17, 2026
