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Calcium Excretion Index
(a.k.a CEI, CaE)
Test Code: CEI
Special instructions
This test requires paired (i.e. taken on the same day) FASTING SERUM (yellow top tube) and URINE samples.
Please collect the SECOND URINE of the day into a yellow Vacuette urine tube. The patient may drink water.
For any queries please telephone RUH ex 4711/4713/4715
Reference Range
CEI ≥22 : Probable hyperparathyroidism, familial hypercalcaemic hypocalciuria excluded.
CEI <22 : Results suggest benign familial hypercalcaemic hypocalciuria.
Please note this only applies if the patient is hypercalcaemic.
Units
µmol/L glomerular filtrate
Turnaround Time
2
days
Department: Biochemistry
Clinical Application
This test may be ordered as an alternative to 24h urine calcium analysis to distinguish between hypercalcaemia caused by primary hyperparathyroidism and benign familial hypercalcaemic hypocalciuria.
