Hypomagnesaemia & Refractory Hypocalcaemia Checker

Serum Magnesium (mg/dL)

mg/dL

Note: Serum magnesium only represents 1% of total body magnesium. Normal serum levels do not necessarily rule out intracellular magnesium depletion.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Evaluating refractory hypokalaemia or hypocalcaemia.

Monitoring patients on long-term PPIs or diuretics.

Workup of unexplained arrhythmias (specifically Torsades).

Screening in alcohol use disorder or malabsorption syndromes.

Category	Mg (mg/dL)	Mg (mmol/L)
Optimal	1.8 – 2.4	0.75 – 1.0
Mild	1.4 – 1.8	0.6 – 0.75
Moderate	1.0 – 1.4	0.4 – 0.6
Severe	< 1.0	< 0.4

Last Comprehensive Review: 2026

Recent Journal Updates

British J Clinical PharmacologyJul 22, 2026

Comment on ‘Linezolid‐induced lactic acidosis in critically ill patients: A multicentre study of incidence, severity and predictors’

Clinical Context

We think this might be relevant to the clinical guidance for Hypomagnesaemia Severity Checker.

British J HaematologyJul 20, 2026

Real‐world outcomes of triplet therapy with gilteritinib, azacitidine and venetoclax in FMS‐like tyrosine kinase 3 (FLT3)‐mutated relapsed/refractory acute myeloid leukaemia: A UK single‐centre experience

Clinical Context

We think this might be relevant to the clinical guidance for Hypomagnesaemia Severity Checker.

British J Clinical PharmacologyJul 20, 2026

Evaluating the pharmacokinetics, efficacy and safety of low‐dose cannabidiol

Clinical Context

We think this has broad domain relevance to Hypomagnesaemia Severity Checker.

Hypomagnesaemia & Refractory Hypocalcaemia Checker

When to Use

When to Use

How it Works

Mg (mg/dL) Thresholds

Clinical Pearls

The Intracellular Ghost

Potassium / Calcium Resistance

The Evidence

Primary Source

Magnesium and Human Health: Perspectives and Research Directions.

Recent Journal Updates

Hypomagnesaemia & Refractory Hypocalcaemia Checker

When to Use

When to Use

How it Works

Mg (mg/dL) Thresholds

Clinical Pearls

The Intracellular Ghost

Potassium / Calcium Resistance

The Evidence

Primary Source

Magnesium and Human Health: Perspectives and Research Directions.

Recent Journal Updates