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.
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.