The technique for cord blood collection is very important. We should know if we have an arterial or mixture blood (venus and arterial). The reference values for these two specimens are very different.
Ihssan
Joan Pearson wrote:
> Before considering physiological or pathological reasons for difference in results between foetal scalp and cord blood, it is worth considering sample quality.
>
> Scalp samples are extremely difficult to collect at the best of times, but staff who do it are often not well-trained in sampling technique. Samples can be contaminated with vaseline, amniotic fluid, meconium etc. We have found our midwives to be quite resistant to training - they often assume that if they can get a "result" from the blood gas analyser, then it must be OK.
>
> Dr MJ Pearson
> Department of Clinical Biochemistry & Immunology
> Old Medical School
> Leeds General Infirmary (Leeds Teaching Hospitals NHS Trust)
> LEEDS LS1 3EX
> UK
>
> tel (44)-113-392-3945
> fax (44)-113-343-5672
>
> http://www.leedsteachinghospitals.com
>
> >>> "Galloway, Peter" <[log in to unmask]> 08/05/03 11:55am >>>
> 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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