Surely it must be possible to agree to one formula for corrected Calcium,
and a range of albumin for which this should be applied. Do laboratories add
a comment as to what range of albumin the correction should be applied.
Trevor point regarding computers and cut off points is very valid, as we
sepnd a lot of time talking about method variation etc, and then the
computer flags a results with a difference of 0.2 as normal one time and
abnormal the next. Although one expects the individual reading the report to
realise this, many GPs feel if a result is marked "abnormal", they must
follow it up at that time.
____________________________________________________________
Dr. Helen Grimes, Dept. of Clinical Biochemistry, UCH, Galway, Ireland
-----Original Message-----
From: Trevor Walmsley [mailto:[log in to unmask]]
Sent: 19 August 2003 06:49
To: [log in to unmask]
Subject: Re: Corrected Calcium
More pertinent question are
what calculation is used?
what is the reference range?
how many decimal places is the corrected calcium reported to?
We use
Corrected Calcium = Calcium + 0.025*(40 - Albumin)
Albumin 0 dp, total calcium 2 dp
Reference range: 2.2 - 2.6 mmol/L
As an aside
With this reference range and the vagaries of our computer system 2.60
is normal and 2.66 is flagged as abnormal, however with a reference
range of 2.20 - 2.60 then 2.60 is normal and 2.61 is abnormal. Which
means that if the result is reported to 1 dp then in the first case a
calculated result of 2.61 would report as 2.6 (a normal result) in the
first case and 2.6* (result flagged high) in the second case.
cheers
Trevor Walmsley
"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
>>> Elizabeth Mac Namara <[log in to unmask]> 19/8/03 6:30 am
>>>
I have always had an automatic correction for albumin in any lab I have
been
in charge of. When someone orders a calcium they also get an albumin
and
corrected calcium. I can't work without it myself so I do not see why
anyone
else should. The converse of this is every year the Ministry of Health
in
Quebec ask me to account for the fact that I do more albumin than any
other
laboratory in Quebec. So I can say I am very much alone on this one.
Elizabeth Mac Namara
JGH Montreal
-----Original Message-----
From: Clinical biochemistry discussion list
[mailto:[log in to unmask]]On Behalf Of Mohmed Ashmaig
Sent: August 7, 2003 8:14 PM
To: [log in to unmask]
Subject: Corrected Calcium
Dear All,
Is any one out their do not use corrected calcium
equation with Alb??
What about the USA laboratories.. do they use it or
not?
Many thanks for all replies
Mohmed Ashmaig
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