Chapter 9
Analyze the Comparative C
T
Experiment
View the QC Summary
Applied Biosystems 7500/7500 Fast Real-Time PCR System Getting Started Guide for Relative Standard Curve
and Comparative C
T
Experiments
180
Notes
Possible Flags
For comparative C
T
experiments, the flags listed below may be generated by the
experiment data.
If a flag does not appear in the experiment, its frequency is 0. If the frequency is >0, the
flag appears somewhere in the experiment; the well position is listed in the Wells column.
Analysis
Guidelines
When you analyze your own comparative C
T
experiment:
• In the Flag Details table, click each flag that has a frequency >0 to display details
about the flag. If needed, click the troubleshooting link to view information on
correcting the flag.
• You can change the flag settings:
– Adjust the sensitivity so that more wells or fewer wells are flagged.
– Change the flags that are applied by the 7500 software.
For More
Information
For more information on the QC Summary screen or on flag settings, open the
7500 Software Help by clicking
or pressing
F1
.
Flag
Description
AMPNC
Amplification in negative control
BADROX
Bad passive reference signal
BLFAIL
Baseline algorithm failed
CTFAIL
C
T
algorithm failed
EXPFAIL
Exponential algorithm failed
HIGHSD
High standard deviation in replicate group
MTP
Multiple Tm peaks
Note:
This flag is displayed only if the experiment includes a melt curve.
NOAMP
No amplification
NOISE
Noise higher than others in reaction plate
NOSIGNAL
No signal in well
OFFSCALE
Fluorescence is offscale
OUTLIERRG
Outlier in replicate group
SPIKE
Noise spikes
THOLDFAIL
Thresholding algorithm failed