Contact :Duty Scientist
DOWNLOAD Combined Postnatal sample referral form
Blood samples for cytogenetic analysis must be taken into lithium heparin tubes. Ideally, samples for both cytogenetic and molecular Genetic (DNA) analysis should be split equally between lithium heparin and EDTA tubes. . Blood samples for array comparative genomic hybridisation MUST be in EDTA (see array CGH guidelines).
As a general guide, 1ml per year of life is an appropriate blood sample to take for children up to the age of five.
For fetal blood sampling see the Prenatal instructions and for cord/cardiac blood see the Solid Tissues guidelines.
We require 1-2ml of blood to be collected into a paediatric lithium heparin tube (orange top). Mix well (by inverting the tube) after collection. The minimum acceptable quantity is 0.5ml.
We require 5-10ml of blood (unless otherwise requested by the laboratory) to be collected in a lithium heparin tube (orange top tube, or green top vacutainer). Mix well by inverting the tube after collection.
DESPATCH together with a COMPLETED LEGIBLE REFERRAL FORM – the sample should be packed in a hard cardboard box (not a padded envelope). All blood specimens should be sent DOOR TO DOOR to the Wessex Regional Genetics Laboratory to arrive within 48 hours of collection, i.e. by first class post, courier service, hospital transport, etc. If there is an unavoidable delay between the collection of the sample and its dispatch, the blood can be stored in a refrigerator at 4oC.