Electrolyte Blood Test

Apr 12, 2026

Electrolyte Blood Test

An electrolyte blood test measures sodium, potassium, chloride, and bicarbonate—minerals that carry electrical charges essential for heart rhythm, muscle contraction, nerve signalling, fluid balance, and maintaining proper pH levels in your body. Electrolyte imbalances can cause symptoms from fatigue and muscle cramps to dangerous heart arrhythmias.

At Blood Test London, electrolyte testing costs from £245 with results in 2-3 days. A doctor always reviews every result.

Check Your Electrolyte Levels

What Electrolytes Do

Electrolyte

Key Functions

Normal Range

Sodium

Fluid balance, nerve/muscle

136-145 mmol/L

Potassium

Heart rhythm, muscle

3.5-5.0 mmol/L

Chloride

Fluid balance, digestion

98-106 mmol/L

Bicarbonate

pH balance

22-29 mmol/L

Symptoms of Imbalance

Low Potassium (Hypokalaemia)

  • Muscle weakness

  • Cramps

  • Fatigue

  • Heart palpitations

  • Constipation

Low Sodium (Hyponatraemia)

  • Confusion

  • Headache

  • Nausea

  • Fatigue

  • Muscle cramps

Who Should Test?

  • Taking diuretics

  • Kidney disease

  • Heart failure

  • Vomiting or diarrhoea

  • Excessive sweating/exercise

  • Poor dietary intake

  • Unexplained muscle weakness

Book Your Test

Price: From £245
Results: 2-3 days
Doctor review: A doctor always reviews every result

Book via WhatsApp | Phone: 020 3951 3429

Blood Test London by The Wellness. Electrolyte testing from £245. A doctor always reviews every result.