Roche cobas s 201 system User manual

Type
User manual

Roche cobas s 201 system is a fully automated sample preparation and PCR amplification system for molecular diagnostic testing. It processes samples in batches, with each batch consisting of samples and controls. The system can pipette large primary pools of up to 96 donor samples, and it also supports 2D pooling for retesting samples from reactive large primary pools. The cobas s 201 system is designed for use with Roche-manufactured external controls (RMECs) and allows up to five user-defined external controls (UDECs) to be assigned to each test.

Roche cobas s 201 system is a fully automated sample preparation and PCR amplification system for molecular diagnostic testing. It processes samples in batches, with each batch consisting of samples and controls. The system can pipette large primary pools of up to 96 donor samples, and it also supports 2D pooling for retesting samples from reactive large primary pools. The cobas s 201 system is designed for use with Roche-manufactured external controls (RMECs) and allows up to five user-defined external controls (UDECs) to be assigned to each test.

07/2008, version 1.0 2.1
Pipetting 2
Batch Concept
The cobas s 201 system is designed to process samples in batches. A batch
is a collection of samples and controls that are pipetted, extracted, and
amplified and detected together according to the rules for the associated
test specification.
A batch consists of all of the samples and controls in one SK24 rack.
A batch is tracked from pooling through results review using the SK24
rack ID plus a unique batch ID assigned during pipetting.
Samples and controls in the batch are tracked by associating their scanned
barcode IDs with the unique barcode clips that hold S-tubes (during
pooling and sample preparation) and K-tubes (during amplification and
detection).
Figure 2.1
Batch
SK24 Rack ID
Unique S-tube
Barcode Clip
2.2 07/2008, version 1.0
Roche-Manufactured External Controls (RMECs)
Each batch requires Roche-manufactured external controls (RMECs).
The number of RMECs required is test-specific.
MPX testing encompasses five analytes. Five positive RMECs plus one
negative RMEC must be pipetted for each batch. During pipetting, an
aliquot of the negative control is transferred to the S-tube in position 19 of
each SK24 rack. Then, aliquots from each positive control are transferred
to S-tubes in positions 20 through 24 of each SK24 rack (Figure 2.2).
Pipetting of RMECs always occurs before sample pipetting. This
allows the operator to correct any control pipetting errors before
sample pipetting begins.
RMECs are always placed in the last positions in each SK24 rack so
that the entire testing process, from extraction through
amplification and detection, is monitored by control samples.
User-Defined External Controls (UDECs)
The cobas s 201 system allows up to five user-defined external controls
(UDECs) to be assigned to each test. UDEC requirements, including the
control name, barcode pattern, lot number, expiration date, and position
of the UDECs in the SK24 rack, are specified by the laboratory
administrator.
Once UDECs are assigned for a particular test, the operator can determine
whether to include them in a pipetting run.
If included, UDECs are always pipetted in the first SK24 rack.
UDECs are identified in the Roche PDM Pooling Manager and Roche
PDM Data Manager screens and reports.
Figure 2.2
MPX RMECs in an SK24 Rack
Negative
Positive
Controls
Control
Pipetting
07/2008, version 1.0 2.3
Deep-Well Plates
Identical deep-well plates are used as Library Plates and Intermediate
Plates during pipetting of large Primary Pools (Figure 2.3).
Every deep-well plate has a unique barcode label.
Library Plate
A Library Plate can be prepared during Primary Pooling to save an aliquot
from each donor tube in case Secondary Pooling is required.
Secondary Pooling can be performed directly from the donor tubes
if a Library Plate is not prepared or if a particular well in the
Library Plate is unusable.
Use of a Library Plate is an option that is configured during
installation.
The well position that a sample occupies in the Library Plate is
dependent on the number of samples in the run and the type of
pooling that is being performed.
Intermediate Plate
An Intermediate Plate is required when pipetting large Primary Pools.
The Intermediate Plate holds interim 12-specimen pools that are then
combined to form a large Primary Pool.
Details of pipetting large Primary Pools are described in the
following section.
Figure 2.3
Library Plate and Intermediate Plate
2.4 07/2008, version 1.0
Primary Pools
A large
Primary Pool
is a multi-specimen (
n
=
24
,
48
, or
96
donor samples)
pool that is created for initial sample testing.
Pipetting large Primary Pools is a two-step process consisting of 1) a Plate
Run and 2) a Batch Run. Each is a separate pipetting run.
Plate Run
During a Plate Run, aliquots from groups of donor samples are combined
in Intermediate Plate wells to create 12-
specimen
interim pools.
The number of donor samples that are loaded must be a multiple of the
final pool size (24, 48, or 96). The maximum number of donor samples
that can be pipetted depends upon the pipettor that is used:
•Up to 864 donor samples can be pipetted when the Hamilton
Microlab STAR IVD Pipettor is used
•Up to 384 donor samples can be pipetted when the Hamilton
Microlab STARlet IVD Pipettor is used
Pipetting a Plate Run for a 96-specimen pool is summarized below.
Pipetting a Plate Run for a 24- or a 48-specimen pool is similar.
1 mL of each donor sample is aspirated from the first group of
donor sample tubes and dispensed into wells in a Library Plate. The
process is then repeated with 700 μL aliquots from the same donor
sample tubes, resulting in the transfer of 1.7 mL aliquots of donor
samples to corresponding wells of the Library Plate (Figure 2.4).
135 μL is aspirated from the Library Plate wells and dispensed into
the first column of Intermediate Plate wells (used to store the
interim pools) (Figure 2.4).
If a Library Plate is not prepared, 135 μL aliquots are pipetted
directly into the Intermediate Plate from the donor sample tubes.
Figure 2.4
Pipetting of the First Group of Donor Samples During the Plate Run
(Example of a Plate Run for a 96-Specimen Primary Pool)
Library Plate
Intermediate Plate
32-Position Donor Tube Carrier
1 mL +700 μL
135 μL
Position 1
Position 32
Pipetting
07/2008, version 1.0 2.5
The process is then repeated with the next group of donor samples.
1.7 mL of each donor sample in the group is transferred to the next
available wells of the Library Plate, and 135 μL is then aspirated
from those Library Plate wells and dispensed into the same column
of Intermediate Plate wells as the first group of donor samples
(Figure 2.5).
The process continues until all of the donor samples that are
included in the first large Primary Pool have been pipetted and the
wells in the first column of the Intermediate Plate contain aliquots
of twelve donor samples
The entire process is then repeated to create interim pools for each
additional large Primary Pool, using additional wells in the
Intermediate Plate for the additional interim pools.
At the end of the Plate Run, the Library Plate(s) contain 1.565 mL aliquots
from each of the donor sample tubes, and the Intermediate Plate wells that
are used each contain pooled 135 μL aliquots from twelve donor sample
tubes.
Figure 2.5
Pipetting of the Next Group of Donor Samples During the Plate Run
(Example of a Plate Run for a 96-Specimen Primary Pool)
Library Plate
Intermediate Plate
32-Position Donor Tube Carrier
1 mL +700 μL
135 μL
Position 1
Position 32
2.6 07/2008, version 1.0
Batch Run
During a Batch Run, aliquots are pipetted from Intermediate Plate wells
into S-tubes to create the large Primary Pool (Figure 2.6):
500 μL aliquots from two wells are pipetted into one S-tube for a
Primary Pool size of 24
250 μL aliquots from four wells are pipetted into one S-tube for a
Primary Pool size of 48
125 μL aliquots from eight wells are pipetted into one S-tube for a
Primary Pool size of 96
Intermediate Plates from more than one Plate Run can be loaded. The
maximum number of Intermediate Plates that can be pipetted depends
upon the pipettor that is used:
•Up to 5 Intermediate Plates can be pipetted when the Hamilton
Microlab STAR IVD Pipettor is used
•Up to 4 Intermediate Plates can be pipetted when the Hamilton
Microlab STARlet IVD Pipettor is used
Figure 2.6
Pipetting of Two 96-Specimen Pools During a Batch Run
Intermediate Plate
125 μL
Pipetting
07/2008, version 1.0 2.7
Repeat Batch Run
A Repeat Batch Run
creates another large Primary Pool to replace one with
an
invalid test result
.
The Repeat Batch Run uses the Intermediate Plate
that was created during the first step (the Plate Run) of the original
Primary Pooling run.
A Repeat Batch Run must be pipetted from the Intermediate Plate.
If an Intermediate Plate well is not available the samples are
scheduled for Resolution Pooling.
Load only one Intermediate Plate to preform a Repeat Batch Run.
During a Repeat Batch Run, aliquots from the same Intermediate Plate
wells used to create the original large Primary Pool (Figure 2.6) are
pipetted into S-tubes to create the replacement Primary Pool (Figure 2.7).
Figure 2.7
Repeat Batch Run for a 48-Specimen Primary Pool
Intermediate Plate
250 μL
2.8 07/2008, version 1.0
2D Pooling
2D Pooling (two dimensional pooling) is used to retest samples from
reactive large Primary Pools. During 2D Pooling, each sample is pipetted
into two different pools with a sample distribution (Figure 2.8) that allows
non-reactive sample(s) to be identified after a single run.
Samples from one Primary Pool can be processed during a 2D
Pooling run.
The number of 2D Pools that are created depends on the size of the
reactive large Primary Pool:
Figure 2.8
Sample Distribution in 2D Pools
(Example of 2D Pooling for a 48-Specimen Primary Pool)
Library Plate
Primary Pool 2
Primary Pool 1
Six-Specimen Pools
S-tube Positions 1-8
Eight-Specimen Pools
S-tube Positions 9-14
Pool Size Number of 2D Pools Aliquot of each Sample
24 4 pools of 6 specimens
6 pools of 4 specimens
167 μL
250 μL
48 8 pools of 6 specimens
6 pools of 8 specimens
167 μL
125 μL
96 Two batches each containing:
8 pools of 6 specimens
6 pools of 8 specimens
167 μL
125 μL
Pipetting
07/2008, version 1.0 2.9
Pipetting a 2D Pooling run for a 48-specimen pool is summarized below.
Pipetting a 2D Pooling run for a 24- or a 96-specimen pool is similar.
If a Library Plate is not used, if a Library Plate well is invalid, or if a
Library Plate well contains insufficient volume, aliquots can be
pipetted from donor sample tubes.
167 μL aliquots of donor samples are aspirated from four wells in
the first column of the Library Plate and dispensed into four
S-tubes, starting in position 1 of the SK24 rack (Figure 2.9).
125 μL aliquots of donor sample are then aspirated from the same
four Library Plate wells and dispensed into a single S-tube in
position 9 of the SK24 rack.
167 μL aliquots of donor samples are aspirated from four wells in
the next column of the Library Plate and dispensed into four
S-tubes, starting in position 5 of the SK24 rack.
125 μL aliquots of donor sample are aspirated from the same four
Library Plate wells and dispensed into the single S-tube in position
9 of the SK24 rack.
At this point, the S-tubes in positions 1 through 8 of the SK24 rack
each contain an aliquot of a single donor sample, and the S-tube in
position 9 contains an aliquot of eight donor samples (Figure 2.9).
Figure 2.9
Pipetting the First Eight Wells
(Example of 2D Pooling for a 48-Specimen Primary Pool)
Library Plate
Position 9
167 μL
125 μL
2.10 07/2008, version 1.0
The process is then repeated for the next eight wells on the Library
Plate. 167 μL aliquots of donor samples are again dispensed into
the S-tubes in positions 1 through 8 of the SK24 rack, and 125 μL
aliquots are dispensed into a single S-tube in position 10 of the
SK24 rack (Figure 2.10).
The process continues until all donor samples have been pipetted.
When the run is completed, the S-tubes in positions 1 through 8 of
the SK24 rack each contain aliquots of a six donor samples, and the
S-tubes in positions 9 through 14 each contain aliquots of eight
donor samples.
Figure 2.10
Pipetting the Next Eight Wells
(Example of 2D Pooling for a 48-Specimen Primary Pool)
Library Plate
SK24 Rack
167 μL
125 μL
Pipetting
07/2008, version 1.0 2.11
Confirmation Pooling
Confirmation Pooling is used to retest samples from reactive large
Primary Pools when there is additional evidence (e.g., a positive serology
test) that suggests one or more samples in the Primary Pool is reactive.
Confirmation Pooling is also used to retest Short Pools.
Samples that are suspected to be reactive are pipetted in individual pools.
The remaining samples are pooled in multi-specimen pools (Figure 2.11).
Samples from one Primary Pool can be processed during a
Confirmation Pooling run.
Up to four samples from a Primary Pool of 48 or 96 can be selected
for pipetting in single-specimen pools. Up to two samples from a
Primary Pool of 24 can be selected for pipetting in single-specimen
pools.
The multi-specimen pools are prepared as 12-, 11-, 6-, or 4-specimen
pools, depending on: 1) the number of samples in the Primary Pool and 2)
the number of donor samples selected for individual testing. The volume
of sample that is aspirated for each size multi-specimen pool is
summarized below:
Figure 2.11
Sample Distribution in Confirmation Pools
(Example of Confirmation Pooling for a 48-Specimen Primary Pool)
Library Plate
Primary Pool 2
Primary Pool 1
Multi-Specimen Pools
S-tube Positions 1-4
Single-Specimen Pools
S-tube Positions 5-8
Multi-Specimen Pool Size Aliquot of each Sample
12-specimen 92 μL
11-specimen 92 μL
6-specimen 167 μL
4-specimen 250 μL
2.12 07/2008, version 1.0
Pipetting during Confirmation Pooling is summarized below:
If a Library Plate is not used, if a Library Plate well is invalid, or if a
Library Plate well contains insufficient volume, aliquots can be
pipetted from donor sample tubes.
Aliquots (92 μL, 167 μL, or 250 μL) of donor samples are aspirated
from wells in the first group of presumed non-reactive Library
Plate wells. Each sample aspiration is dispensed into an S-tube,
starting in position 1 of an SK24 rack.
The process is repeated, skipping the wells (or donor tubes) for any
donor samples that are suspected of being reactive (Figure 2.12).
Figure 2.12
Pipetting Presumed Non-Reactive Confirmation Pools
(Example of Confirmation Pooling for a 48-Specimen Primary Pool)
Library Plate
SK24 Rack
92 μL
Pipetting
07/2008, version 1.0 2.13
After all aliquots of presumed non-reactive donor samples have
been pipetted, 1 mL aliquots of the presumed reactive donor
samples are aspirated from their wells (or donor tubes) and
dispensed into individual S-tubes (Figure 2.13).
Figure 2.13
Pipetting Presumed Reactive Individual Pools
(Example of Confirmation Pooling for a 48-Specimen Primary Pool)
Library Plate
SK24 Rack
1 mL
2.14 07/2008, version 1.0
Resolution Pooling
A Resolution Pool is a single-specimen pool that is created for samples
that 1) have pipetting errors during the Primary Pooling run or 2) are
contained in a reactive Confirmation Pool or reactive 2D Pool. A
Resolution Pool is prepared by pipetting an aliquot from a Library plate
well into its own S-tube.
The laboratory administrator can also elect to use Resolution
Pooling to resolve invalid results.
The sample can be aspirated from the donor tube if a Library Plate
is not available or if the Library Plate well for that donor sample is
unusable.
Up to 36 samples can be processed during a Resolution Pooling
run.
During Resolution Pooling, 1 mL of a sample is aspirated from its well in
the Library Plate and dispensed into a single S-tube.
Figure 2.14
Pipetting Resolution Pools
Library Plate
SK24 Rack
1 mL
Wells selected for Resolution Pooling
Pipetting
07/2008, version 1.0 2.15
Handling of Pipetting Errors
Plate Run
During a Plate Run, the Hamilton Microlab STAR IVD / STARlet IVD
Pipettor combines equal aliquots from groups of donor samples to create
12-specimen interim pools in an Intermediate Plate well (see page 2.4).
A pipetting error during the Plate Run may result in one or more of the
Intermediate Plate wells having less than 12 specimens. An Intermediate
Plate well must contain 9 to 12 specimens to be valid. A well containing
less than 9 specimens is automatically invalidated by the system. Wells that
are invalidated by the system (and wells that are manually rejected by the
user) are not included in the Batch Run.
Batch Run
During a Batch Run, the Hamilton Microlab STAR IVD / STARlet IVD
Pipettor combines aliquots from the Intermediate Plate wells to create a
Large Pool in the S-tube (see page 2.6).
Intermediate Plate wells that are invalid are not pipetted during the Batch
Run. Instead, additional sample is pipetted from one (or more) valid
wells, so that the S-tube contains 1 mL, the volume required for successful
processing on the COBAS® AmpliPrep Instrument.
2.16 07/2008, version 1.0
Example 1 - Pipetting Error During a Pool of 96 Run
One donor tube (Rack 1, sample 16 in the example in Figure 2.15)
contains insufficient volume (or e.g., a clot) and is not successfully
pipetted during the Plate Run. Therefore, one Intermediate Plate well
(H1in the example) contains aliquots from 11 instead of 12 donor
samples.
An Intermediate Plate well containing 11 donor samples is valid. When
the Intermediate Plate is loaded for a Batch Run, the system pipettes
aliquots from all of the valid wells and creates a pool containing 95 donor
samples.
Figure 2.15
Example of Pipetting a Pool Containing 95 Donor Samples
First Group
Plate Run (one pipetting error)
Batch Run
Second Group
Third Group
Last Group
Pipetting
07/2008, version 1.0 2.17
Example 2 - Pipetting Error During a Pool of 96 Run
Several donor tubes (five in the example in Figure 2.16) cause pipetting
errors during the Plate Run. The result is that one Intermediate Plate well
(B1 in the example) contains 11 instead of 12 donor samples and one well
(H1 in the example) contains 8 instead of 12 donor samples.
The well containing 11 donor samples is valid and is included in the Batch
Run. The well containing 8 donor samples is not valid and is skipped. One
of the valid wells (A1) is pipetted twice to make up the required 1 mL
volume. The pool created during the Batch Run contains aliquots from 83
donor samples.
Figure 2.16
Example of Pipetting a Pool Containing 83 Donor Samples
First Group
Plate Run (five pipetting errors)
Batch Run
Second Group
Third Group
Last Group
2.18 07/2008, version 1.0
Pool Size
An Intermediate Plate well that contains 9 to 12 samples is
considered valid.
A minimum of one valid Intermediate Plate well is required to
perform a Batch Run.
During a Batch Run the system pipettes an additional aliquot from a valid
well when an Intermediate Plate contains an invalid well. For example, if
the Intermediate Plate contains one invalid well, one of the valid wells is
pipetted twice to create the S-tube pool. If the Intermediate Plate contains
two invalid wells, two of the valid wells are pipetted twice to create the
pool in the S-tube.
The maximum number of donors in a Large Pool is 24, 48, or 96,
depending on the system configuration. The minimum number of donors
in a Large Pool is 9.
When a pool contains a reduced number of donor samples, the sample
volume for some of the donors in the pool is increased. Donor sample
volume can vary from 1/96 (for a 96-specimen pool) to 1/9 of the total
volume.
Repeat Batch Run
The rules for pipetting samples from the Intermediate Plate for a Repeat
Batch Run are the same as the rules for pipetting in a Batch Run. Wells
containing 9 to 12 samples are included in the run. Wells containing less
than 9 samples are excluded. When an invalid well is excluded, a valid well
is pipetted in its place.
Secondary Pooling
Reactive short pools are not scheduled for 2D Pooling. Instead, reactive
short pools that contain 18 or more samples are scheduled for
Confirmation Pooling. Donor samples in reactive short pools that contain
fewer than 18 samples are scheduled for Resolution Pooling.
The samples that caused the pipetting error are either scheduled for
another Plate Run or they are scheduled for Resolution Pooling,
depending on when the pipetting error occurred.
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Roche cobas s 201 system User manual

Type
User manual

Roche cobas s 201 system is a fully automated sample preparation and PCR amplification system for molecular diagnostic testing. It processes samples in batches, with each batch consisting of samples and controls. The system can pipette large primary pools of up to 96 donor samples, and it also supports 2D pooling for retesting samples from reactive large primary pools. The cobas s 201 system is designed for use with Roche-manufactured external controls (RMECs) and allows up to five user-defined external controls (UDECs) to be assigned to each test.

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