Bloodscreening project

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Bloodscreening quality project News release dd 12-09-2001

Until now we have four members in the INDIA bloodscreening project. This is a

very good start for a long term blood screening quality project. The following

points where discused

Costs involved

The information service for this project is free a off any charges. In the long

term we will seek funds from the EU or other organizations for the cost

recovery. As a starting point you can use the service for your own local blood

bank. In this case there are no out of pocket costs involved with the exception

of the costs you already made for the reference sample you prepared by yourself

or received from the manufacturer of the reagents. In case you start a quality

circle you have to take in account some out of pocket costs for the distribution

of the reference sample. The distribution costs involve: transportation and

packing material.

Logistical details

The production, administration and distribution of reference samples are the

responsibility of the members of the quality circle. Starting with a single

bloodbank and scaling up to two or more will give time to build a distribution

network

-Statistical details " Shewart Control Chart " and " Cumulative distribution "

The control chart is a simple graphical device which is useful in keeping track

of production quality. Control " implies that some static condition exist. If the

quality does improve or change significantly we say we have no longer control,

and we depend upon our control chart to detect the change. On the vertical axis

we have a scale for observed values of the variable. On the horizontal axis we

have a scale for days, or time at which the sample was taken. A solid horizontal

line is drawn through the expected (assumed) value, and two parallel lines are

drawn, one above and one below the solid line. We plot the observed value of the

sample and plot it in the chart. If the point is between the parallel lines we

say that the process is in control and take no further action. If the point is

above the upper or below the lower line we say that the procedure is out of

statistical control, and we attempt to find the factor which is causing the

extreme observation. We wish the chance of asserting lack of control to be very

small when the static condition still exists. We control this chance by the

distance between the parallel lines, the so called Upper Control Limit and Lower

Control Limit. In practice it is customary to use 3*Sigma / square (N) as

control lines. For a normal distribution these control lines give a 0,27% chance

of deciding erroneously that there is a lack of control. The statistical

method's applied have as a goal to detect systematic deviations from deviations

witch occur by chance. The control value's are calculated from the sample in the

case that they are not supplied by the user. Besides the statistical upper and

lower control limits you can specify a technical control limits. The technical

control limits are determined based on technical or economical criteria and must

be supplied by the user.

Participation

We are still looking for participance for our bloodscreening project. I am

looking for contacts/laboratory who are interested to participate in trial

projects. In case you are interested in the concept please reply to this e-mail.

Kind regards

Nivard

jnivard@...

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