Electrolyte check referral

An electrolyte check may be recommended in a range of everyday health situations.

• Dehydration or fluid imbalance
• Vomiting or diarrhoea
• Kidney or heart conditions
• Monitoring certain medications, such as diuretics  
• Unexplained weakness, cramps, or confusion
• Routine monitoring during illness or hospital care  

An electrolyte check measures several key minerals in the blood that work together to maintain balance within the body.

Sodium (Na⁺)  

• Helps regulate fluid balance and blood pressure

Potassium (K⁺)  

• Important for heart rhythm and muscle function  

Chloride (Cl⁻)

• Helps maintain fluid and acid–base balance

Bicarbonate (CO₂)

• Reflects acid–base balance in the body

Each electrolyte plays a specific role in keeping the body functioning normally.   

In most cases, a little preparation may be needed:

• Fasting is usually not required 
• Drink fluids as advised by your doctor
• Avoid heavy exercise before the test if possible
• Inform your doctor about any medications or supplements you take  

Your GP will let you know if any specific preparation is required.  

Tip: It’s best to check with your telehealth GP during your consult about preparation and next steps for an electrolyte test.  

• Results show whether electrolyte levels are within expected ranges  
• Abnormal levels may reflect dehydration, medication effects, or illness
• Results are interpreted alongside symptoms and medical history 

• Electrolyte levels can change quickly
• A single test may not reflect long-term balance  
• Results must be interpreted within a clinical context