Cr-51 Red Cell Survival
(See Figures 9-5 and 9-6.)
To
set
up
as
the
standard
number
of
samples
and
the
count
time,
click
on
the
<Procedure
Definition>
icon
in the primary tool bar and then enter the red cell survival maximum number of samples and counting
time. Once set, these will be the default values for each new study performed.
NOTE:
This
information
in
<Procedure
Definition>
can
be
set-up
anytime
for
all
procedures
before
counting
any
patients. These are your default counting parameters.
The Cr-51 Red Cell Survival test follows the procedures from the published Mallinckrodt Red Cell
Survival Test Kit. In order to perform this test, assemble all the blood samples, appropriate hematocrits,
the standard, and a background vial to count. When entering the data for this test, enter the hematocrit
that is associated with each sample number as well as entering the day the sample was drawn (i.e.,
sample drawn after 72 hours is Day 3.) Since the Red Cell Survival Test stretches over many days, there
can be days skipped between when samples are drawn.
To perform a Red Cell Survival Test:
1. Either enter a new patient and pick the Red Cell Survival procedure for this patient, or go to the Patient
Window, select the existing patient and add the Red Cell Survival as a new test for this patient. Once
the patient has been set up for the Red Cell Survival, proceed to the counting screen for this patient.
2. At the counting screen, verify that the correct patient and ID# are on the page.
3.
Click
on
<Preferences>.
In
the
preferences
window
is
displayed
the
counting
time
and
the
number
of samples to be counted. You can correct the number of samples and increase or decrease the
numbers as desired. Once you have set the count time and the number of samples, click <OK>. You
can now proceed to count.
4. Put the background vial into the well counter and click <Background>. The system will count the
background for the pre-determined time. When done, the counts per minute and the counting time,
plus the time/date that background was counted will be displayed.
5. After background is counted, the system will highlight the 24 hour sample. Remove the background
vial from the well counter and place the vial with the 24 hour sample into the well counter.
6. On the left side of the page is displayed Sample #1, Day #1 and hematocrit as 0%. Enter a value for
hematocrit by first double clicking on the box and then typing in the correct value for Sample
#1 Hematocrit.
7. Click on <Sample> to count the 24 hour blood sample. When done counting, the system will display
and enter the counts, counting time and hematocrit into the chart.
8. When it is finished counting, the system will proceed to Sample #2. Remove Sample #1 and put
Sample #2 into the well counter.
9. On the left side of the screen is displayed Sample #. Below that, the day is listed as zero and hematocrit
is listed as zero. Using the <UP/DOWN Arrows>, set the day to match the day on which the sample
was drawn. Enter the hematocrit number by first double clicking on the box and then entering the
appropriate hematocrit. When you are done entering hematocrit as a percentage, click on <Sample>.
The system will now count Sample #2. When it is done counting, the results will be displayed.
10. The system will now advance to the third sample and display Sample #3 on the left side of the
screen. Using the <UP/DOWN Arrows>, enter the day the sample was drawn. Now enter the
hematocrit value by double clicking on the box and then entering the hematocrit as a percentage.
CONTENTS
9-9 HEMATOLOGY
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