The software calculates the Contiguous Read Length for each capillary. Capillaries
that are below the threshold fail. The remaining results that the software displays are
for information only.
Result
Description
Contiguous Read Length
(CRL)
The longest uninterrupted segment of bases with an
average Quality Value (QV)
³
20.
In addition to evaluating the QV of a base call, the software
considers the QV of adjacent bases within a ±21-bp moving
average to determine a contiguous read length based on
quality values.
CRL Pass/Fail
• BDTv1.1—Capillaries with a CRL <600 bp fail.
• BDTv3.1 (General Sequencing)—Capillaries with a
CRL <500 bp fail.
• MicroSEQ
™
ID – Capillaries with a CRL <600 bp fail.
For information only— The alignment of the base-called sample sequence with the
known reference of the sequencing install standard is used to calculate the following
results.
CRL Basepair Accuracy
CRL Basepair Accuracy is determined by basepair
comparison between the base-called sample sequence
and the known reference sequence of the sequencing
install standard within the contiguous read length region
calculated (as described in the CRL definition above).
Read Length
The length of read (in bases) at which base calling
accuracy is
³
98.5%.
The Read Length is measured only within the following
regions:
• BDTv1.1: 20– 619 bp (maximum value is 600)
• BDTv3.1 (General Sequencing): 40– 539 bp (maximum
value is 500)
• MicroSEQ
™
ID: 20– 619 bp (maximum value is 600)
The Read Length value is derived from basecall accuracy,
and not from quality values.
Basepair Accuracy (Read
Length Accuracy)
Basepair Accuracy calculates the percent of accurate
basecalls in the known reference sequence within the
Read Length of the sequencing install standard.
CRL Median and SD
Median and standard deviation determined for all
capillaries.
Pass/fail criteria
for the sequencing
install check
Chapter 6
Run calibrations and install checks
Run a Sequencing install check
6
3500/3500xL Genetic Analyzer User Guide—Data Collection Software v3.1
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