PFA-100 System – Instruction Manual (US) – Version 1.0.1
812
12 Diagnostics and troubleshooting
12.5.3 Test Terminated Due To Flow Obstruction
The following table contains information about the circumstances in which the message TEST TERMINATED DUE
TO FLOW OBSTRUCTION occurs and how to proceed afterwards.
Description Causes Solutions/Comments Result Interpretation
The analyzer has detected a
sudden stoppage of blood
flow during the test. A flow
obstruction can occur at the
start of a test or during a test
run. Refer to the instructions
for use (Limitations of
Procedure section) for further
information.
• Initial Flow Obstruction
This type of flow obstruction occurs
when the analyzer detects a failure
to establish initial blood flow rate
specifications subsequent to the
first 30 seconds of testing. The
analyzer aborts the run if these
specifications are not met. The
result is reported as TEST
TERMINATED DUE TO FLOW
OBSTRUCTION. This condition
may be caused by micro thrombin in
the sample or particulates
introduced into the sample or PFA
test cartridge from the environment.
• Flow Obstruction During a Test
A flow obstruction that occurs after
initial blood flow rate conditions
have been established is reported
by the analyzer at the time the flow
obstruction occurs; i.e. > 80SEC.
FLOW OBSTRUCTION. This type
of flow obstruction occurs when the
capillary or the PFA test cartridge
membrane aperture is suddenly
plugged by micro aggregates that
may form during the test or by
particulates introduced into the
sample or PFA test cartridge from
the environment.
• Defective PFA test cartridge
• Verify that the sample does not
contain clots or aggregates. If no
aggregates are visible, repeat once
to rule out a defective PFA test
cartridge.
• A sample that results in repeated
flow obstruction may have resulted
from problems during blood
collection. Recollect blood sample
and repeat test.
• If problems persist, contact
Siemens Service.
Non-reportable
Table 12-3 Test Terminated Due To Flow Obstruction
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