Philip
I did an audit about 18 months ago, and found that one GP practice was
going lots of (unnecessary) GTTs. Many of these had rather odd results,
with 2hr glu lower than fasting. I was worried that these patients were
not fasting, but further investigation showed:
1) patients were told not to eat anything before the test, but were not
told about drinking tea etc
2) as there was nowhere for them to wait, they were told to go home or
go shopping and then come back in 2hrs (or thereabouts!) for the second
test.
Tightening up on use of the proper WHO protocol has led to the GTTs
looking much more sensible.
I don't know how much effect it has, but some of the patients had normal
GTTs at the surgery later had IGT/DM when retested - but could be within
experimental error for GTTs.
Cathryn Corns
Head of Biochemistry
Southend Hospital
01702 435555 ext 4058
-----Original Message-----
From: Hyde Philip (ULHT) [mailto:[log in to unmask]]
Sent: 12 December 2003 11:18
To: [log in to unmask]
Subject: Activity and GTTs
Does anyone know of evidence relating to the effect patient movement may
have on the 2-hour glucose value during a OGTT? We have difficulty
keeping tabs on patients having to fill in 2 boring hours after intake
of glucose in what is always an overcrowded phlebotomy area. Two GP
surgeries tell their patients its OK to browse around town before having
the 2h sample taken. How strict are other sites?
Philip Hyde
Pilgrim Hospital
Boston
UK
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