CAPINTEC, INC. CAPTUS
®
600
Lab Tests – Blood
Blood Volume Test
Blood Volume determinations involving radioactive tagging are most frequently used in
specific disease conditions when the hematocrit may not accurately estimate true blood
volume. Such conditions include extensive trauma or burn patients, certain types of
anemia, and polycythemia. Most frequently used radioactive tracers are protein labeled I-
125 for plasma measurements and Cr-51 tagged RBC’s for red cell mass determinations.
RBC Survival Test
RBC survival determinations involving radioactive tagging are most frequently used in
diagnosis of hemolytic anemia. The CAPTUS
®
600 software and default counting
parameters follow the testing protocol outlined in the Mallinckrodt RBC Survival
Instructions which utilize Sodium Chromate Cr-51 Injections. The software standardizes
the 24 hour sample to 100% survival, and automatically decay corrects each subsequent
sample. This permits the user to measure each sample as soon as it is collected. For this
reason, all sample volumes must be the same. Each sample must also have a hematocrit
(HCT) measurement. The subsequent samples are corrected for any differences in
hematocrit.
Staff Bioassay
All staff members who work with Iodine-131, Iodine-125, or Iodine-123 need to have regular
Bioassay measurements taken to monitor exposure levels. Most state and federal radiation
safety regulations mandate that these thyroid measurements be taken periodically.
The CAPTUS
®
600 can store data for up to 20 staff members for bioassay measurements.
The CAPTUS
®
600 uses one bioassay protocol, which is user-defined. Before using the
Capintec CAPTUS
®
600
system to perform bioassay measurements on the staff, the staff
member names, ID numbers and initials should be stored in the CAPTUS
®
600 memory (if
not, the results can't be saved), as well as the parameters for the bioassay protocol.
2-10 FUNCTIONAL & TECHNICAL DESCRIPTION November 07
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