What is the Electrolytes Test?

The Electrolytes test measures key minerals in the blood that carry an electrical charge and are vital for normal bodily function. These electrolytes help regulate fluid balance, nerve impulses, muscle contraction and acid–base balance.

Electrolyte levels are tightly controlled by the kidneys and hormonal systems. Even small imbalances can cause significant symptoms, making this test essential in both routine health assessments and acute medical evaluation.

The test is commonly used as part of general health screening and in the investigation of dehydration, kidney disease and metabolic disorders.

Why do I need an Electrolytes test?

You may need this test if you have symptoms suggestive of fluid or mineral imbalance or if you are being monitored for kidney, heart or endocrine conditions. Electrolyte disturbances can occur due to illness, medication use, dehydration or excessive fluid intake.

Testing helps identify imbalances early, allowing prompt correction and prevention of complications such as cardiac rhythm disturbances or neurological symptoms.

Symptoms and scenarios where testing is recommended:

• Dehydration or fluid overload
• Muscle cramps or weakness
• Irregular heartbeat
• Confusion or dizziness
• Kidney disease monitoring
• Diuretic or blood pressure medication use
• Vomiting or diarrhoea
• Routine health screening

What’s Tested in This Profile?

• Sodium
• Potassium
• Chloride
• Bicarbonate

Benefits of the Electrolytes Test

• Assesses hydration status
  Identifies dehydration or fluid imbalance.
• Supports kidney function evaluation
  Electrolytes reflect renal regulation efficiency.
• Monitors heart rhythm risk
  Potassium and sodium are critical for cardiac function.
• Detects acid–base disturbances
  Bicarbonate helps assess metabolic balance.
• Guides medication management
  Important for patients on diuretics or ACE inhibitors.
• Supports acute illness assessment
  Essential in emergency and inpatient care.
• Useful in chronic disease monitoring
  Tracks electrolyte stability over time.
• Simple but clinically powerful test
  Provides rapid insight into metabolic health.

Step-by-Step: How Testing Works

Choose your preferred testing method

You can attend one of our UK partner clinics or arrange a home or hotel visit with a mobile phlebotomist.

Option 1 – In-Clinic Blood Draw

1. Select your nearest UK clinic and book an appointment.
2. A clinician or phlebotomist collects a venous blood sample.
3. The sample is analysed for electrolyte levels.
4. Results are delivered securely online.

Option 2 – Home or Hotel Phlebotomy (+£60)

1. Book a UK-wide home or hotel visit at a convenient time.
2. A trained phlebotomist collects your blood sample on-site.
3. The sample is transported to the laboratory.
4. Results are uploaded digitally without the need to travel.

Your Results Explained

Low Levels

Low sodium or potassium may indicate dehydration, kidney dysfunction or hormonal imbalance.
Low potassium can increase the risk of muscle weakness and heart rhythm disturbances.
Typical UK reference ranges vary by electrolyte and laboratory.

Normal Levels

Normal electrolyte levels suggest stable fluid balance, kidney function and metabolic control.
This supports healthy nerve and muscle activity.

High Levels

Elevated electrolytes may indicate dehydration, kidney disease or medication effects.
High potassium or sodium requires prompt medical review due to cardiac risk.