Sample types, requirements and the frequently asked questions.
Sample types and requirements:
- Blood (minimum 1ml) in an EDTA (lavender top) tube
- Saliva (collected with an Oragene DNA OG-500 kit/OGD-500 or OG-575 & OGD-575)
- Extracted DNA*
- Minimum 2 μg** in TE buffer or equivalent (please do not dilute in water)
- Concentration > 20 ng/μl (optimal concentration 20 – 150 ng/μl) and with a minimum volume of at least 40 μl. Please ensure to provide at least 2 μg extracted DNA.
- Stored in a DNase-free microcentrifuge tube (ideal: 1.5 ml snap-cap microcentrifuge tube).
Please note that:
- As many liver cells are polyploid, DNA extracted from liver tissue is only accepted for Family Member Testing of a known sequence variant (not accepted for NGS based tests or copy number changes).
- We do not perform maternal cell contamination (MCC) studies for prenatal samples (chorionic villus samples, amniocytes, fibroblasts, amniotic fluid samples etc.). We recommend MCC testing be performed locally for any prenatal testing sent to Blueprint Genetics.
- We do not accept DNA extracted from formalin-fixed paraffin-embedded (FFPE) tissue.
*DNA must be extracted by a qualified laboratory with one or more of the following certifications / accreditations: CLIA certification, CAP accreditation, accreditation equivalency as determined by CMS, accreditations and certifications from established international organizations and/or government agencies)
**If DNA concentration is measured using a fluorescence-based DNA quantification method such as Qubit, 2 µg of DNA is sufficient. However, if the measurement is done using spectrophotometric methods, twice as much DNA is required as the concentration has likely been overestimated. If our DNA quality and quantity control demonstrate that the amount of DNA provided is less than what is required, we will request a new sample before beginning the analysis.
Frequently asked questions
My patient had a blood transfusion. What sample types are accepted?
If your patient has received any blood product containing white blood cells (leukocytes), wait 2 weeks from the time of transfusion before collecting a sample.
Transfusions of packed red blood cells, plasma or platelets are not expected to affect the analysis. Patients who have received these blood products can provide a sample at anytime.
My patient has hematological disease such as myelodysplastic syndrome or leukemia. What sample types are accepted?
Acquired somatic mutations present in many hematologic diseases may complicate the interpretation of next generation sequencing (NGS) results. Therefore, DNA isolated from sources containing leukocytes (blood, saliva, oral rinse and buccal swabs) is not accepted. DNA extracted from cultured skin fibroblasts or another non-hematologically derived tissue is required.
My patient had an allogenic hematopoietic stem cell transplant. What sample types are accepted?
DNA extracted from cultured skin fibroblasts is the only post-transplantation source of DNA that is accepted if the patient had an allogeneic hematopoietic stem cell transplant.
Submitting a DNA sample from other sources in this situation increases the risk of contamination by donor DNA and false negative results. If available, a DNA sample taken prior to transplantation can be submitted.
You must indicate on the test requisition or in Nucleus that your patient has undergone an allogenic hematopoietic stem cell transplant in addition to the source of the extracted DNA.
How should samples be collected, labeled and stored before shipping?
- Blood should be collected in an EDTA tube (lavender top) designated for blood samples.
- The tube should be labeled with the patient’s name, date of birth and date of sample collection.
- The blood tube should be labeled with “infectious” if the sample is known to contain infectious material, for example, Hepatitis B-, Hepatitis C- or HI-virus.
- If the patient has received an allogenic hematopoietic stem cell transplant, blood is not accepted.
- Hemolyzed or clotted blood samples will not be accepted.
- The blood sample should be sent as soon as possible after it has been collected. The sample can be sent at room temperature. We recommend using transport tubes in accordance with IATA regulations 650. For more information, please see FAQ > Shipping.
- If it is necessary to store the sample prior to shipping, it should be refrigerated immediately. If the sample will be stored for longer than 3 days, the sample should be kept frozen until shipped.
- DNA samples should be sent in TE buffer or equivalent, or in any standard elution buffer used for DNA isolation.
- The sample tube should be labeled with the patient’s name, date of birth, DNA concentration and volume. Ideally, a 1.5 ml snap-cap microcentrifuge tube sealed with parafilm should be used.
- DNA quality and quantity will be evaluated upon arrival at Blueprint Genetics. We will request a new sample sample if the DNA quality or quantity does not meet our standards for analysis.
- DNA should be extracted or isolated in laboratory qualified with one or more of the following certifications / accreditations:
– CLIA certification
– CAP accreditation
– accreditation equivalency as determined by CMS
– accreditations and certifications from established international organizations and/or government agencies
- The sample can be sent at room temperature. We recommend using transport tubes in accordance with IATA regulations 650. For more information, please see FAQ > Shipping.
Saliva samples should be collected in the tube provided in the kit. Please follow the manufacturer’s collection instructions carefully (DNA Genotek > Collection Instructions). Instructions are provided in the kit and can be found on the manufacturer’s website in multiple languages. Samples collected improperly (e.g. sample is mainly mucus not saliva) will not be accepted.
The sample tube must be labeled with the patient’s name, date of birth and date of sample collection. Samples without proper labeling will not be accepted.
The sample can be stored and sent at room temperature. For more information, please see the FAQ > Shipping.
For further support, please contact our Support team at firstname.lastname@example.org or ask us to contact you: blueprintgenetics.com/contact.
Fax: +358 9 8565 7177
Biomedicum Helsinki 1
Fax: +1 650 446 7790
1268 Missouri Street