Influence of the syringe materials on arterial blood gas measurements
Toda, H.; Murakawa, M.; Arai, T.; Hatano, Y.; Mori, K.
Masui. Japanese Journal of Anesthesiology 36(5): 694-698
1987
ISSN/ISBN: 0021-4892 PMID: 2958645 Document Number: 301187
Changes in O2 and CO2 tensions of arterial blood sampled in glass (G), polypropylene (PP) and polyethyleneterephthalate (PET) syringes were compared during a period of 120 min after sampling. Blood samples were divided into three groups according to the PaO2 values immediately after sampling: group I. < 150 mmHg; group II; 150 .apprx. 300 mmHg; and group III, > 300 mmHg. PaO2 values of all the types of syringes in group I increased significantly within 60 min (P < 0.01) while those in group III fell significantly (P < 0.01) and those in group II changed little. PaO2 values with PP syringes in group I were significantly higher than those with G and PET syringes after 30 min. and those in group III were significantly lower during the period of investigation (P < 0.01). PaCO2 increased significantly with all the types of syringes within 120 min. These findings suggest that changes in PaO2 values within 120 min after sampling are mainly due to the permeation through the syringes and those in PaCO2 to the metabolism of blood cells. O2 appears to be more permeable to PP than to G and PET.