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ID:119 Magnesium
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DescriptionA trace metal important as a co-factor for many enzyme reactions and in DNA synthesis.
IndicationMI,cardiac dysrhythmias, alcoholism, hypokalaemia, prolonged diarrhoea, TPN, unexplained hypocalcaemia or hyponatraemia.
Additional InfoHYPOMAGNASAEMIA:Mg deficiency is often associated with signs of hypocalcaemia (Mg is a cofactor of PTH). Deficiency is relatively uncommon as the body can conserve Mg well but can occur due to reduced intake caused by GI disorders (steatorrhea, malabsorption etc). Renal disease can cause hypomagnasemia due to increased urinary loss or defects in renal reabsorption. Also consider hyperaldosteronism, hyperparathyroidism and DM (increased urinary loss). Diuretics, alcohol and nephrotoxic drugs (aminoglycosides, cyclosporinn, cis-platin) can also cause hypomagnasaemia.
Concurrent Testsna
Dietary Requirementsna
InterpretationWhilst hypomagnasaemia is indicative of Mg deficiency, a normal magnesium level does not rule out deficiency. Hypermagnasaemia is usually iatrogenic (e.g antacid therapy, treatment of pre-eclampsyia) and is symptomatic >4 mmol/L.

TubeSerum or Heparin
Tube Picture
Collection ConditionsUse Gold top (serum gel) tube except for Intensive care units, renal unit, transplant unit, patients on IV heparin (use Green/Yellow top tube for these patients). This test can also be run on trace metals tube (Royal blue top)
Min. Vol1 mL

Ref. Range (Male)0.7 - 1.0 (> 16 years)
Ref. Range (Female)0.7 - 1.0 (>16 years)
Ref. Range (Paed) see info below
Ref. Range Notes0 - 4 wks: 0.6 - 1.0, 1 - 16 yrs: 0.7 - 1.0
IP Acute TATRefer to Website
IP Routine TATRefer to Website
GP Acute TAT- Contact Laboratory
GP Routine TATRefer to Website
Turnround CommentMinimum retest interval = 36 hours

Originally edited by : MC. Review due on 21/06/2017 12:04:22. Published By S.BENNETT on 21/06/2016 12:04:22.