Abstract
OBJECTIVE: To determine the level of correlation between sodium, potassium and creatinine readings between point-of-care venous blood gas (VBG) and laboratory biochemistry measurements (LBM). METHODS: Data was obtained from three Monash Health (one of the largest health networks in metropolitan Melbourne) emergency departments. 16,527 VBGs were matched with LBM for sodium, 16,437 for potassium and 8,597 for creatinine. Pearson correlation and further subgroup analyses were carried out to explore if acid-base imbalance affected sodium, potassium or creatinine reliability in VBG. RESULTS: The range of VBG values showed more variation in comparison to LBM. There was good correlation (r>0.8, p<0.001) between measured values with the exception of potassium in acidaemia, however, there was consistent and statistically significant difference in measured values. CONCLUSIONS: The small mean differences across all three parameters observed although statistically significant are unlikely to be clinically significant. With minor calibrations, this would be an easily corrected problem. As such, we recommend that sodium, potassium and creatinine measurements can be used interchangeably between the VBG and LBM, with the exception of potassium levels in acidaemia. Potassium levels in acidaemia should be used with caution due to lower correlation.
Original language | English |
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Pages (from-to) | 38-43 |
Number of pages | 6 |
Journal | New Zealand Medical Journal |
Volume | 131 |
Issue number | 1487 |
Publication status | Published - 14 Dec 2018 |
Cite this
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Reliability of venous blood gas sodium, potassium and creatinine. / Pouryahya, Pourya; Lin, Zhiliang Caleb; Tan, Lynn; Meyer, Alastair.
In: New Zealand Medical Journal, Vol. 131, No. 1487, 14.12.2018, p. 38-43.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Reliability of venous blood gas sodium, potassium and creatinine
AU - Pouryahya, Pourya
AU - Lin, Zhiliang Caleb
AU - Tan, Lynn
AU - Meyer, Alastair
PY - 2018/12/14
Y1 - 2018/12/14
N2 - OBJECTIVE: To determine the level of correlation between sodium, potassium and creatinine readings between point-of-care venous blood gas (VBG) and laboratory biochemistry measurements (LBM). METHODS: Data was obtained from three Monash Health (one of the largest health networks in metropolitan Melbourne) emergency departments. 16,527 VBGs were matched with LBM for sodium, 16,437 for potassium and 8,597 for creatinine. Pearson correlation and further subgroup analyses were carried out to explore if acid-base imbalance affected sodium, potassium or creatinine reliability in VBG. RESULTS: The range of VBG values showed more variation in comparison to LBM. There was good correlation (r>0.8, p<0.001) between measured values with the exception of potassium in acidaemia, however, there was consistent and statistically significant difference in measured values. CONCLUSIONS: The small mean differences across all three parameters observed although statistically significant are unlikely to be clinically significant. With minor calibrations, this would be an easily corrected problem. As such, we recommend that sodium, potassium and creatinine measurements can be used interchangeably between the VBG and LBM, with the exception of potassium levels in acidaemia. Potassium levels in acidaemia should be used with caution due to lower correlation.
AB - OBJECTIVE: To determine the level of correlation between sodium, potassium and creatinine readings between point-of-care venous blood gas (VBG) and laboratory biochemistry measurements (LBM). METHODS: Data was obtained from three Monash Health (one of the largest health networks in metropolitan Melbourne) emergency departments. 16,527 VBGs were matched with LBM for sodium, 16,437 for potassium and 8,597 for creatinine. Pearson correlation and further subgroup analyses were carried out to explore if acid-base imbalance affected sodium, potassium or creatinine reliability in VBG. RESULTS: The range of VBG values showed more variation in comparison to LBM. There was good correlation (r>0.8, p<0.001) between measured values with the exception of potassium in acidaemia, however, there was consistent and statistically significant difference in measured values. CONCLUSIONS: The small mean differences across all three parameters observed although statistically significant are unlikely to be clinically significant. With minor calibrations, this would be an easily corrected problem. As such, we recommend that sodium, potassium and creatinine measurements can be used interchangeably between the VBG and LBM, with the exception of potassium levels in acidaemia. Potassium levels in acidaemia should be used with caution due to lower correlation.
UR - http://www.scopus.com/inward/record.url?scp=85058724388&partnerID=8YFLogxK
M3 - Article
VL - 131
SP - 38
EP - 43
JO - New Zealand Medical Journal
JF - New Zealand Medical Journal
SN - 1175-8716
IS - 1487
ER -