Consulting Reference Information 8-5
P/N 85213-30, Manual revision: B
To determine if the 15% ECV limit may be exceeded, the estimated maximum
ECV should be divided by the Estimated Total Blood Volume of the donor/patient.
A donor/patient with a hematocrit of less than 38% and an estimated blood
volume of less than 3600 ml can be expected to reach the 15% ECV limit during
the procedure.
Determining final
product
volume(s)
The MCS+ device is designed to determine final product volume(s) either by:
! Counting the number of pump revolutions.
or
! Weighing the product.
In certain MCS+ protocols, the plasma and platelet product volumes are deter-
mined by the weigher. To convert the product weight to a volume, the device
utilizes a conversion factor of 1.026 g/ml. The Procedure Complete Screen and
Haemo Update Screen will provide the operator with detailed product volume
information.
To manually determine the collection product volume, the operator should:
" Weigh the final product on a calibrated scale.
" Subtract the weight of the empty collection container(s) from the product
weight.
" Divide by 1.026 g/ml.
Calculating
platelet yield
The platelet yield in a final platelet product can be calculated by multiplying the
platelet concentration of the final product by the total final product volume. The
platelet yield is calculated in 10e11 platelets.
Note: When the platelet concentration is provided using the units of 10e3/µl
or 10e6/ml, the factor 100,000 should be used to arrive at the correct number of
digits.
For example, if the platelet concentration in the product is 1300 x 10e3/µl
and the product volume was 300 ml, the platelet yield can be calculated to be
1300 x 300/100,000 or 3.9 x 10e11 platelets.
Product Volume =
Total Weight – Empty Bag Weight
1.026
ml
Platelet Yield =
Platelet Concentration x Product Volume
100,000
Platelets
11
10
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