Send Us a Sample
Samples are collected on day 5 of life on a blood
spot card. All sections on the bloospot cards should be
completed. The laboratory operates a strict zero tolerance
policy for samples received with a missing or inaccurate NHS
number, sample date or date of birth. We strongly advise
checking for transcription errors before sending cards to the
Please ensure that the maternity unit code is always included on
the bloodspot card to enable acknowledgement of card receipt,
efficient collection of repeat cards and accurate reporting of
A good quality blood spot sample is one that is taken at the
right time, contains sufficient blood to perform all tests, is
despatched to the laboratory in a timely manner and has not been
To learn more about completing the bloodspot card
Babies born at less than 32 weeks gestation (less than or equal
to 31+6 days) need a repeat screening test for CHT at 28 days
postnatal age (counting the date of birth as day 0) or on day
of discharge home, whichever is sooner. Please mark the card 'CHT
preterm repeat'. If the sample is taken at discharge before day 28,
please mark the card 'discharged home'.
Once collected, samples should be sent immediately to the
laboratory using the pre-paid purple envelope that has our
dedicated PO BOX number on it.
Please ensure that the sample is completely dry before inserting
it into the glassine and purple envelope.
Consent and Decline
Although screening is recommended, parents have the option of
declining one or all tests.
If screening is declined, a completed blood spot card marked
'declined' and stating the reason for decline must be sent to
the newborn screening laboratory.
For further details visit: newbornbloodspot.screening.nhs.uk/consent