Blood gases/electrolytes/metabolites
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Instruments
Radiometer ABL800 bench top blood gas analyser
Abbott i-STAT blood and blood gas analysers |
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Location within CDHB
| ABL800 | Biochemistry, CHLabs- 2 x ABL800 |
| ABL800 | Neonatal ICU- Lab Room, Christchurch Women's Hospital (CWH) |
| ABL800 | Birthing Suite, CWH (used for scalp vein pH and cord blood analyses only) |
| ABL800 | Laboratory Ashburton Hospital |
| i-STAT 1 (300 series) |
Neonatal ICU- CWH |
| i-STAT (200 series) | Dept of Anaesthetics- Christchurch Hospital 2 x 200 |
| i-STAT 1 (300 series) | Dept of Anaesthetics- Christchurch Hospital 3 x 300 |
| i-STAT 1 (300 series) | Set up Room, Kaikoura Hospital |
| i-STAT 1 (300 series) | Special Care Unit/OR, Burwood Spinal Unit |
Tests measured
The list of tests available on blood gas analysers is pH, pCO2, pO2, sodium, potassium, chloride, ionised calcium, glucose, lactate, haemoglobin, haematocrit, dys-haemoglobins.
The range of tests available depends upon the configuration of each analyser.
i-STAT cartridges come in about 12 different configurations, none of which measures all tests.
Sample and volume requirements
All volumes quoted are the actual volumes aspirated into the analysers.
A good quality arterial blood gas sample should have a minimum volume of 500µL.
Capillary samples: good collecting technique is essential.
Blood gas capillary tubes generally hold between 90 and 150µL, depending on the brand.
| ABL800 | Capillary or arterial: 95µL |
| i-STAT cartridges | Depending upon test range. Anywhere from 65µL- 150µL. |
Consumables
Please refer to the POCT Coordinator for consumable advice.
Quality Controls
All Radiometer analysers use Radiometer quality control sample, Levels, 1, 2, 3 and 4
i-STAT analysers use i-STAT aqueous controls, levels, 1, 2, and 3.
Refer to the POCT Coordinator for more details.
Reference Range
All reference ranges can be found in the CHLabs test database. Click on the left hand menu link to Canterbury Health Laboratories home page, then click on "Tests".
Sources of Error
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Clotted sample
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Inadequate mixing of sample
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Obtaining of sample from drip arm
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Insufficient sample
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Incorrectly labelled sample
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Use of liquid heparin blood gas syringe as opposed to dry heparin syringe can cause lowering of sodium and ionised calcium due to suppression of ionisation.
Competencies
Available. Please refer to the POCT Coordinator.
