One of our patients presented his patient information leaflet for Priadel
(Lithium Carbonate) to the phlebotomist pointing out that it stated that the
blood sample for Lithium must be taken exactly 12 or 24h after the dose, and
was concerned that he would miss the deadline.
We were under the impression that most lithium is absorbed in the first 8
hours, and that the half life increases with age. We bleed patients between
8 and 14 hours after dose and report the target range as 0.4-1.0 mmol/l
(8-14 hours after dose).
Bleeding patients exactly 12hours after dose, is fairly impractical and the
ensuring arguments due to perceived queue jumping, would be even more
trouble. What do other laboratories do, and how do you explain the 24h
recommendations from Priadel?
Tim Hogan
Basildon
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