RADIOMETER ABL800 FLEX - Page 135

ABL800 FLEX Reference Manual 5. Performance characteristics
Interference tests, Continued
Subjects Age Hct
mean
Hct
95 % range
MCHC
mean, g/L
MCHC
95 % range,
g/L
Men Adults 0.47 0.39 - 0.55 340 310 - 370
Women Adults 0.42 0.36 - 0.48 330 300 - 360
Boys Newborn
1 month
3 months
6 months
9 months
1 year
2 years
4 years
8 years
14 years
0.59
0.50
0.45
0.46
0.45
0.41
0.40
0.37
0.41
0.41
0.53-0.65
0.44-0.56
0.39-0.52
0.39-0.51
0.39-0.52
0.37-0.45
0.36-0.47
0.30-0.44
0.37-0.45
0.36-0.46
330
320
330
300
280
290
300
280
290
300
320-340
310-330
320-340
290-310
270-300
280-300
280-310
270-290
280-300
290-310
Girls Newborn
1 month
3 months
6 months
9 months
1 year
2 years
4 years
8 years
14 years
0.58
0.49
0.44
0.44
0.43
0.43
0.43
0.43
0.40
0.40
0.51-0.65
0.42-0.56
0.39-0.51
0.39-0.50
0.37-0.50
0.37-0.49
0.36-0.50
0.36-0.51
0.36-0.46
0.36-0.47
340
320
330
320
300
300
300
280
280
290
330-350
310-330
320-340
310-330
290-310
290-310
290-310
270-290
270-290
280-300
ctBil sensitivity
for MCHC
variations
(continued)
If ∆MCHC is defined as ∆MCHC = 332 g/L − MCHC, then the contribution to the
relative error on the ctBil measurement is as follows:
∆∆c
c
tBil
tBil
Hct
1 Hct
MCHC
MCHC
=−
−
×
A worst-case example, using 95 % confidence values:
A newborn girl with Hct = 0.58, MCHC = 350 g/L and ctBil = 400 µmol/L. ctHb
may be derived as Hct x MCHC = 0.58 x 350 g/L = 20.3 g/dL (reference range is
18.0 − 21.0 g/dL).
Continued on next page
5-53