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Worcestershire Acute Hospitals NHS Trust
CategoryClinical Biochemistry
Test information
For diagnosis of the Zollinger-Ellison syndrome (gastrin-producing tumour) Record on request patient's serum calcium and urea levels, list of all drugs currently administered and details of any gastric surgery. Patient should fast overnight.  Stop H2 blockers for 72h, and omeprazole for 2 weeks, prior to blood test.
Blood collection into EDTA tubes on ice, separate within 15 min. VISIBLE HAEMOLYSIS INVALIDATES RESULT.
Reference range
<40 pmol/L
Special requirements
Tube type
EDTA on ice
Purple top tube
Minimum volume
1 mL
TAT Inpatient
4 weeks
TAT GP/Outpatient
4 weeks
Referral lab
Dept of Clinical Chemistry (Metabolic Medicine), Hammersmith Hospital
Page last updated: 11 January 2022