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| Type of Sample for Forensic
DNA Testing |
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Each person has a unique genetic profile
( save identical twins) and the cells of
a given person,
irrespective of tissue origin ( they
may come from bone, muscle, blood etc)
have the same DNA content. Therefore
any type of sample/tissue can be used to
generate a genetic profile.
In cases where a buccal swab sample cannot
be obtained (e.g. individual is missing,
deceased, or unable to participate) a forensic
sample (e.g. hair, semen, or blood stains)
can be submitted to our DNA Identity Testing
Center for Forensic
Testing.
| Examples
of samples |
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Dried
blood stains (e.g. dried blood on
garments, carpet, bed sheets bandages,
cotton, paper etc) |
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Dried underwear
stains (e.g. bodily fluids/stains
on underwear, pads, tampons, condoms,
etc) |
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Dried seminal
fluid stains (e.g. stains on underwear,
clothes, tissue, pillowcases, etc.) |
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Dried saliva stains
(e.g. letters, stamps, drinking cups,
napkins, cigarette butts, etc.) |
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Dried urine stains
(e.g. towels, clothes, carpet, fabrics,
etc.) |
| Precautions |
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Hair,
freshly plucked hair from the scalp
works well< prefer >5 hairs
with roots for adults; hair that has
fallen naturally on brushes /pillows
has less DNA in its roots and is not
as efficient. Cut hair does not work.
Hair must have bulb/root. |
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Fingernails and
toenails can be a source of DNA, but
useful amounts present vary among
individuals. |
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Teeth and bone
have DNA, but require an even more
intense extraction process. These
are quoted separately. |
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| Sample
Handling |
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DO
not handle any of the above mentioned
samples with bare hands, to avoid
contamination. Samples should be packaged
carefully, to avoid tampering, abrasion
and/or other damage. |
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| Sample
Storage |
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The
best way to store any of above samples
is in a paper envelope. DO NOT
use a plastic bag. DNA store dry
in paper packaging will be better
preserved. |
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| Obtaining
a good DNA profile is dependent upon the
quality of the sample and whereas we do
our best to obtain a full profile, this
is often limited by the nature of the sample
received. Therefore, we CAN NOT guarantee
that we will obtain full or even partial
DNA profile(s). |
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In
general any sample that has human cells/fluids can be
a source of DNA. Please call 800-DNA-EXAM
or write to our case consultant at DNAtest@800dnaexam.com
for any questions you may have regarding specific samples.
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