Pure base versus mixed base QVs
Pure bases and mixed bases have the same probability of error for the associated
basecall (10
–q/10
). Note the following:
• High-quality pure bases typically have QVs of 20 or higher.
• The distribution of quality values for mixed bases differs dramatically from that
of pure bases.
• Mixed bases have a maximum QV of 20.
• Review all mixed base calls.
Quality values (QV) and probability of error (Pe)
QV
Pe
QV
Pe
1
79.0%
30
0.10%
5
32.0%
35
0.032%
10
10.0%
40
0.010%
15
3.2%
45
0.0032%
20
1.0%
50
0.0010%
25
0.32%
60
0.00010%
The EPT view (ElectroPhoresis Telemetry) shows instrument data conditions
(currents, temperatures, electrophoresis voltage) as a function of time.
Touch on the left border of the plot to display the legend.
EPT plot
Chapter 8
View and analyze results
View results on the instrument
8
SeqStudio
™
Genetic Analyzer Instrument and Software User Guide
117