I have old data showing that delays of up to 7 hrs showed little clinical
difference between fluoride and gel tubes, however this was from GP patients
which all had normal white cell counts. In practice we only ask for fluoride
samples on samples taken at GP surgeries and outlying hospitals, and for
glucose tolerance tests, on the basis that the majority of samples taken
within the hospital will have been centrifuged within 2hours of being taken.
We also insist on fluoride samples from our neonatal unit as they seem to
have a much higher rate of glucose utilisation.
Tim
Basildon
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-----Original Message-----
From: p=NHS NATIONAL
INT;a=NHS;c=GB;dda:RFC-822=ACB-CLIN-CHEM-GEN(a)JISCMAIL.AC.UK;
Sent: 04 September 2002 16:58
To: p=NHS NATIONAL
INT;a=NHS;c=GB;dda:RFC-822=ACB-CLIN-CHEM-GEN(a)JISCMAIL.AC.UK;
Subject:
Glucose and fluoride oxalate - or not
With the exception of blood for glucose tolerance tests I would be
interested to know of any policies for plasma/serum glucose specimen
collection. It is said - "Most labs, these days, use Gel separation
tubes for Glucose and not fluoride oxalate" Is this true ?
The main reason seems to be it's easier and cheaper to use a single tube for
all chemistry tests. We have shown that glucose is stable for about 6 days
at +4 after centrifuging but what about delay, temperature etc before
spinning ? Should I insist upon fluoride oxalate ?
I would like the views of a wider audience.
Robin Barfoot - Clinical Scientist - Whipps Cross University Hospital,
London. UK
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