Abbott i-STAT 1 System Manual page 455

Precision Data (mmol/L)
Aqueous Control
Level 1
Level 3
Method Comparison (mmol/L)
TCO
n
Sxx
Syy
Slope
Int't
Sy.x
Xmin
Xmax
r
Cartridge Comparison
Performance characteristics for TCO
analysis was performed on 40 patient samples using the i-STAT CHEM8+ and i-STAT EC8+ cartridges. In
the 14-30 mmol/L range, the average difference was -0.7 mmol/L.
Factors Affecting Results*
Exposing the sample to air allows CO
partial draw tubes (evacuated tubes that are adjusted to draw less than the tube volume, e.g., a 5 mL tube
with enough vacuum to draw only 3 mL) is not recommended for use with the i-STAT System because of the
potential for decreased TCO
results. Care must also be taken to eliminate "bubbling" of the sample with a pipette when filling a cartridge
to avoid the loss of CO in the blood.
2
Allowing blood samples to stand (without exposure to air) before testing allows TCO
due to metabolic processes.
*It is possible that other interfering substances may be encountered.
Rev. Date: 01-Jul-13
Mean SD
17.4 0.62
34.6 0.62
TCO (Calculated)
(Calculated)
2
Beckman Coulter
2
IL BGE
CX
62
0.40
0.84
1.136 1.155
-4.1
1.38
19.3
43.9
0.965 0.935
are equivalent in all cartridge configurations. System difference
2
to escape which causes TCO
2
values. Under-filling blood collection tubes may also cause decreased TCO
2
Art: 716661-01G
%CV
3.6
1.8
TCO (Measured)
2
Beckman Coulter
3 LX 20
® ®
51 35
0.55 0.48
0.55 0.60
1.152
-2.6 -1.5
1.56 0.96
18.3 21
36.1 35
0.943
to be under-estimated. The use of
2
2
to be over-estimated,
2
TCO2 - 3