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Potassium
(a.k.a K)
minimum sample volume required ~ 5ml
Test Code: CE
Other acceptable tube types
Lithium heparin (pale green)
Special instructions
None
Reference Range
0 - 28 days: 3.4 - 6.0
29 days - <1 year: 3.5 - 5.7
1+ years: 3.5 - 5.3
Time limit for add on
3 days post collection
Units
mmol/L
Linked to
C&E's
Turnaround Time
1
day
Department: Biochemistry
Clinical Application
Some patients exhibit pseudohyperkalaemia, due to release of potassium from red cells, white cells or platelets on clotting: leukaemia and thrombocythaemia should be excluded. Pseudohyperkalaemia can be investigated by taking blood into Lithium-heparin tube and analysing uncentrifuged sample.
