Haemonetics MCS+, Operator And Maintenance Manual

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7-8 Reference Information
P/N 39551-00
, Rev. F
To determine the expected maximum % ECV out, divide the expected maximum
ECV by the estimated total blood volume of the donor.
For a platelet procedure a 5’0”, 110 lb. female (estimated blood volume is 3500
ml) with a hematocrit of 38% is expected to have a maximum ECV of 480 ml,
and a % ECV of 100 x 480/3500 = 13.7%.
Note: Only donors with a hematocrit less than 38% AND a blood volume of
less than 3200 ml are expected to reach an ECV of more than 15%.
Determining
Product
Volume
The MCS+ device determines product volumes either by pump revolutions, or by
product weight. In the SDP and PLP protocols, the plasma and platelet product
volumes are determined by the weigher of the MCS+ device. To convert the
product weight to a volume, the MCS+ device applies a conversion factor of
1.026 g/ml. The Procedure Complete Screen and HaemoUpdate Screen give de-
tailed product volume information.
To manually determine the collected product volume, weigh the total product on
a calibrated scale, and subtract the weight of the empty bags from the product
weight and divide by 1.026 g/ml.
Calculating
Platelet Yields
The platelet yield in a platelet product is calculated by multiplying the concen-
tration of platelets in the product by the total product volume. The platelet yield
is calculated in 10
11 platelets.
Where the platelet concentration is in 10 3 /µl or 10 6 /ml, the factor 100,000 is used
to arrive at the correct number of digits. For example, if the platelet concentration
in the product is 1300 x 10
3
µl and the product volume was 300 ml, the yield
would have been 1300 x 300 / 100,000 is 3.9 x 10 11 platelets.
Expected % ECV = 100 x
Expected Maximum ECV
Estimated Blood Volume
✍
Product Volume =
Total Weight – Empty Bag Weight
1.026
ml
Platelet Yield =
Platelet Concentration x Product Volume
100,000
Platelets
11
10