Magnesium | KK Women's and Children's Hospital

Specimen Container

Gel separator tube (Adult)
Microtube (Paeds)

Specimen Requirement

Plain Blood
Adult: 5 mL
Paediatric: 0.5 mL

Invert blood 5 times after blood collection ensures the clot-activating factors is well mixed with the blood. This will ensure results are reliable.

Orderable as Urgent?

Yes

Turn Around Time

Stat: Average 45 mins (30 mins - 1 hr)
Routine: Average 2 hrs (1 - 3 hrs)

Reference Value(s)

Testing Laboratory Location

KKH

Laboratory

Clinical Chemistry

Contact Number

6394 1383

Day and Time Performed

Daily, 24 hrs

Orderable on CPOE?

Yes

Downtime Form

Clinical Chemistry - Form A

Additional Information

Critical values: Low: < 0.5 mmol/L and High: > 2.0 mmol/L
For patients under magnesium therapy Low: < 0.5 mmol/L and High: > 4.0 mmol/L

Change History Notes

Last Updated - 28 May 2025