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Laboratory Test Reference Guide

Laboratory Information

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Specimen Collection

Specimen Collection Protocols

Must be separated from cells within 2 hours of collection. Haemolysis must be avoided.

Patient Specimen

4 mL blood. K2EDTA Trace element tube (navy blue top). Trace element tubes with either heparin or no additive are also acceptable.

Paediatric Specimen

A full micro EDTA tube

Minimum Volume

1mL plasma

Sample Delivery to Lab


Test Information



Test Availability

Mon -Fri, 0800-1630

Laboratory Testing Time

3 days


Atomic Absorption Spectroscopy

Unit Of Measurement


Reference Interval

9.0 - 17.0 umol/L The reference interval quoted is for non-fasting, random samples. Values are slightly higher for fasting, morning samples (10.7 - 18.3 umol/L). As zinc is highly protein-bound, calculation of an adjusted zinc level is appropriate for hypoproteinaemic patients: Adjusted Plasma Zinc = plasma zinc x (77/Total protein g/L)

Uncertainty Of Measurement


Additional Information

Plasma copper may be measured on the same sample.

Instructions for Referral to Waikato Lab

Aliquot Instructions

If sending from an outside laboratory specimen must be sent separated. Plasma must be separated from Trace Element tube within 2 hours of collection.

Electronic Information

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