Haemonetics MCS+, Operator And Maintenance Manual

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Reference Information 7-9
P/N 39551-00
, Rev. F
Calculating
Platelet
Efficiencies
The platelet collection efficiency can be calculated by dividing the platelet yield
by the total number of platelets that have been processed. The preferred method
of calculating the Platelet Collection Efficiency is based on the average of donor
pre- and donor post-platelet counts. When a post-platelet count is not available,
the donor precount will suffice.
To calculate the platelet collection efficiency:
1. Determine the average platelet count of the donor:
• If both a platelet pre-count and a post-count are available, use the aver-
age of the pre- and post-counts.
• If only a pre-count is available, use the pre-count.
2. Determine the net volume of donor blood processed by subtracting the vol-
ume of anticoagulant used from the total volume processed during the pro-
cedure.
Donor Blood Processed = Total Volume Processed – AC Volume Processed
3. Next, calculate the number of platelets that passed through the bowl during
the procedure:
Example: If the donor platelet count was 250 10 3 /µl and the total donor blood
processed was 3500 ml, the total number of platelets processed was 250 x 3500
/ 100,000 = 8.75 10
11 platelets processed through the bowl.
4. And the platelet collection efficiency is:
Platelets Processed =
Platelet Count x Donor Blood Processed
100,000
Platelets
Platelet Efficiency =
Actual Platelet Yield
Platelets Processed
x 100%