Fresenius Medical Care 5008, Operating Instructions Manual

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Chapter 10: Other Functions
10-12 Fresenius Medical Care 5008 OP 5/09.06
The balance resulting from the sum of all electrolytes with a positive
charge and of all electrolytes with a negative charge must be equal to
0. The maximum deviation resulting from rounding errors is 0.04.
(When adding the electrolytes, it must be observed that some of them
may have a double charge. These electrolytes must be counted twice.)
Calculation example for concentrates indicated in g/l
Some manufacturers indicate the amount of the individual concentrate
components in g/l. For these concentrates, the unit mmol/l of the ready-
to-use dialysate must be calculated based on the atomic weights.
Canister labeling 1:35, NaCl 210.68 g/l
Atomic weight NaCl:
Atomic weight Na 22.990 + atomic weight Cl 35.453 = atomic
weight NaCl 58.443
Conversion NaCl from g/l to mmol/l:
NaCl 210.68 g/l / 35 (mixing ratio) = 6.019 g/l
6.019 g/l / 58.443 (atomic weight NaCl) = 0.103 mol/l = 103 mmol/l
Entry Na
+
:
Na
+
= 103 mmol/l (Na
+
of NaCl) + 35 mmol/l (Na
+
of bicarbonate) =
138 mmol/l (entry Na+)
Electrolytes with a positive charge (+) Electrolytes with a negative charge (–)
Positive electrolytes Value Total Negative electrolytes Value Total
Na
+
(sodium) 138.00 138.00 Cl
-
(chloride) 109.50 109.50
K
+
(potassium) 2.00 2.00 HCO
3
-
(bicarbonate) 32.00 32.00
Ca
++
(calcium) 1.75 3.50 CH
3
COO
-
(acetate) 3.00 3.00
Mg
++
(magnesium) 0.50 1.00
TOTAL 144.50 TOTAL 144.50