From memory we found that the foetal scalp capilliary contained ammonium
heparin which slowly killed off the glucose electrode on our gas
machine.
cheers
Trevor
"If you have more than enough then you have someone elses"
Trevor Walmsley, Canterbury Health Labs, Christchurch, New Zealand.
Phone: (0064 3) 364 0326 Fax:Phone: (0064 3) 364 0320
eMail: [log in to unmask]
Internet: http://www.cdhb.govt.nz/chlabs/staff/trevorw.htm
>>> "Galloway, Peter" <[log in to unmask]> 5/8/03
10:55 pm >>>
I am aware that obstetricians occasionally use foetal scalp pH to
assess
foetal wellbeing. In my ignorance, I am not aware of how well this has
correlated with cord blood pH at birth, and in particular whether it
is
possible to get very different results.
I have twice seen results of approximately pH 6.7-6.8 in the last 8
months, where after emergency section the cord pH was 7.3-7.35. On the
latest occasion, the glucose was also measured and found to be <1.5
mmol/l.
Presumably the samples (3 in total from each case) were collected from
an area of crowned ischaemic scalp which no longer reflects the foetus
?
If so how often does this occur, and are there any other ways of
identifying this phenomena ?
Any guidance would be gratefully received.
Peter Galloway
Yorkhill NHS Trust
Glasgow
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