Skip to content

Investigator 24Plex QS

Definition

Qiagen 26-plex STR kit with Quality Sensor (IPC) and covering 24 STR loci plus DYS391 and Amelogenin. GO! variant uses increased cycles for challenging samples.

Manufacturer
Qiagen
Loci covered
24 STR loci plus DYS391 and Amelogenin
Quality control
Built-in Quality Sensor (internal PCR control)
Sensitive variant
GO!, uses increased cycles for challenging samples

Common questions

What does the Quality Sensor (IPC) detect?+

It monitors amplification of an internal control alongside the sample, flagging PCR inhibition or degraded template so a no-result can be distinguished from a genuine assay failure.

When would a lab choose the GO! variant?+

For degraded, low-quantity or otherwise challenging samples, where the increased cycle number improves sensitivity, though this comes at some cost to stutter and allele-balance interpretation.

Related terms

Allelic Drop-Out
Failure of one allele of a heterozygous locus to amplify detectably, a stochastic effect of low-template amplification where sampling of limited template...
ESSplex SE QS
Qiagen kit covering the European Standard Set of 17 loci plus DYS391 and Amelogenin; optimised for EU Prüm database upload.
GlobalFiler
Applied Biosystems 25-plex STR kit covering 24 STR loci plus Amelogenin, compatible with both CODIS 20 and ESS17 requirements.
Haematin
Degradation product of haemoglobin that inhibits Taq polymerase by chelating Mg2+ ions and binding to the polymerase active site; most common inhibitor...
Humic Acid
Organic polymer from soil degradation that inhibits PCR by intercalating into double-stranded DNA and disrupting primer annealing.
Identifiler Plus
Applied Biosystems 16-plex STR kit covering the original 13 CODIS loci plus D2S1338, D19S433, and Amelogenin. Widely used through the 2010s; insufficient...
IPC (Internal PCR Control)
A non-forensic DNA sequence spiked into the PCR reaction at fixed concentration; a shift in IPC Ct value relative to the expected...
Low-Copy-Number (LCN) PCR
PCR protocol using increased cycle numbers (typically 34 cycles) developed at the UK FSS to generate profiles from template inputs below ~100...
PowerPlex Fusion 6C
Promega 23-plex STR kit covering all 20 CODIS core loci, all 17 ESS loci, DYS391, and Amelogenin across 6 dye channels.
Probabilistic Genotyping
Software-based interpretation of complex DNA electropherograms using continuous statistical models (e.g. STRmix, TrueAllele, ArmedXpert). Generates a likelihood ratio for complex mixtures previously...

Explained in

Your journey to becoming a forensic professional starts here.

Practice with mock tests, learn from structured notes, and get your questions answered by a global forensic community, all in one place.