Reliability of laboratory findings from blood samples when only the double dead space in catheter is discarded
Section: Healthcare Management
How to quote
Tineo Drove T, Santos MA, Díaz A, Jiménez S, Iturralde I, Ramos A, et al. Fiabilidad de los resultados analíticos de muestra sanguínea desechando el doble del espacio muerto del catéter. Metas Enferm 2014; 17(1): 6-10.
Authors
1Tania Tineo Drove, 2María Ángeles Santos Ampuero, 3Ana Díaz López, 4Sonia Jiménez García, 4Itziar Iturralde González, 4Angélica Ramos Herrera, 5Francisco Rodríguez Salvanes, 6Lorena Vega Piris, 7Mercedes Gómez Puyuelo
Position
1Doctora en Enfermería. Enfermera Unidad de Reanimación. Hospital Universitario de la Princesa. Madrid.2Anestesiologa. Doctora en Medicina. Hospital Universitario de la Princesa. Madrid.3Médico especialista en Análisis Clínicos. Jefa de sección y coordinadora de Laboratorio. Hospital Universitario de la Princesa. Madrid.4Enfermera Unidad de Reanimación. Hospital Universitario de la Princesa. Madrid.5Licenciado en Medicina. IIS Hospital Universitario de la Princesa. Madrid.6Estadístico. IIS Hospital Universitario de la Princesa. Madrid.7Supervisora Unidad de Reanimación. Hospital Universitario de la Princesa. Madrid.
Contact address
Tania Tineo Drove. Hospital de La Princesa. Unidad de Anestesia-Reanimación (Planta 7). C/ Diego de León, 62. 28006 Madrid.
Contact email: taniatd@gmail.com
Abstract
Purpose: to assess reliability of two blood sample drawing methods though an arterial catheter in patients admitted to a postoperative resuscitation unit.
Material and methods: a quasi-experimental study was carried out at Hospital de la Princesa, Madrid, Spain, from February to May 2010. Two sequentially used methods for drawing blood samples for laboratory tests through a peripheral arterial catheter were compared: firstly the intervention procedure = 2 cc of blood discarded + a 13.5 sample for laboratory testing; and secondly the control procedure = immediately after previous sample drawing = 15.5 cc + a 13.5 sample for laboratory testing. Biochemistry, hematology and coagulation laboratory parameters were compared.
Results: differences in mean values were very low for all assessed parameters. Zero value is always included in confidence intervals; therefore, differences were not statistically significant (p > 0.05). Correlation is higher than 0.93 for all assessed biochemistry parameters, higher than 0.84 for hematology parameters, and higher than 0.90 for coagulation parameters (p < 0.05 for all comparisons).
Conclusions: discarding the volume corresponding to the double dead space in the system (2 cc in our study) is adequate to ensure quality in laboratory testing results.
Keywords:
Anemia; arterial catheter; blood sample; hematology parameterscritical patient
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