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Date: | Mon, 29 May 2006 11:47:28 +0100 |
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Recently there has been discussion of the practice of test weighing, which I
know is a staple of LC practice for many of you. Here in the UK we do not
do this, and even for professionals who are generally out of date it has
been accepted for some years that this is not to be done in order to assess
feeding. So I am interested in seeing this research -- which I am just now
printing, so cannot comment on the full study. I am sure that those of you
who use this technique will also be interested in knowing about this paper.
Magda Sachs PhD
Arch Dis Child Fetal Neonatal Ed. 2006 May 22; [Epub ahead of print]
Accuracy and precision of test weighing to assess milk intake in newborn
infants.
Savenije OE, Brand PL.
Princess Amalia Children's Clinic, Isala klinieken, Zwolle, Netherlands.
OBJECTIVE: To assess accuracy and precision of test weighing to estimate the
amount of milk intake in newborn infants. Study design: 94 newborn infants
fed by bottle, cup, or nasogastric tube, were weighed before and immediately
after feeding by a blinded investigator. Actual milk intake was determined
by reading the ml scale of the milk container before and after feeding. The
accuracy and precision of test weighing was assessed by examining the
frequency distribution of the difference between weight change and actual
milk intake. Weighing performance of the scale was assessed by calculating
the standard deviation (SD) of repeated weighing standard weights of 1.5 and
4 kg. RESULTS: The mean difference between weight change and actual milk
intake (accuracy) was 1.3 ml, with 95% of differences ranging from -12.4 to
15 ml (precision). The maximum difference was 30 ml. This difference was not
influenced by the presence of monitor or oxygen saturation wires,
intravenous lines, or vomiting of the infant. The maximal SD of repeated
weighings was 0.97 g. CONCLUSIONS: Test weighing is too imprecise to be
clinically useful in newborn infants. Infant weighing scales are not
sensitive enough to pick up small changes in infants' weight after feeding.
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