In case of adults it can be done with arterialized ear lobe sample How arterialized capillary sample is taken Site Finger, toe, heel or ear lobe – Wrapping in warm pad (40-43 C) for 10 minutes Massage ear lobe for 2-3 minutes Heparinised capillary tube should be sealed after collecting sample with clay at one end Short steel wire is inserted then other end is sealed Steel wire is moved with magnet to mix the sample Correlation between the ABG, VBG & CBG Normal Values Arterial Capillary venous PH 7.35 - 7.45 7.35 - 7.45 7.32 - 7.42 PO2 90 100mmHg 60 80mmHg 24 48mmHg – – – PCO2 35 45mmHg 35 45mmHg 38 52mmHg – – – O2 saturation 90 100% 90 100% 40 70% – – – HCO3 19 - 25 m Eq /L 19 - 25 m Eq / L 19 - 25 m Eq /L Base excess -3 to +3 -3 to +3 -3 to +3 Correlation between VBG & ABG There is a good correlation in PH (pooled mean difference to 0.035 pH units), HCO3 (Mean difference 1.41 mmol/L), Lactate (mean difference 0.08), Base excess (Mean –
In case of adults it can be done with arterialized ear lobe sample How arterialized capillary sample is taken Site – Finger, toe, heel or ear lobe Wrapping in warm pad (40-43 C) for 10 minutes Massage ear lobe for 2-3 minutes Heparinised capillary tube should be sealed after collecting sample with clay at one end Short steel wire is inserted then other end is sealed Steel wire is moved with magnet to mix the sample Correlation between the ABG, VBG & CBG Normal Values Arterial Capillary venous PH 7.35 - 7.45 7.35 - 7.45 7.32 - 7.42 PO2 90 – 100mmHg 60 – 80mmHg 24 – 48mmHg PCO2 35 – 45mmHg 35 – 45mmHg 38 – 52mmHg O2 saturation 90 – 100% 90 – 100% 40 – 70% HCO3 19 - 25 m Eq /L 19 - 25 m Eq / L 19 - 25 m Eq /L Base excess -3 to +3 -3 to +3 -3 to +3 Correlation between VBG & ABG There is a good correlation in PH (pooled mean difference to 0.035 pH units), HCO3 (Mean difference – 1.41 mmol/L), Lactate (mean difference 0.08), Base excess (Mean
ABG%20VBG%20CBG.docx