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Potassium

Vitamins & Minerals

38.00

Private Potassium testing in London for £38, measuring one essential electrolyte marker with results expected in around 1–2 days.

Turnaround time

1-2 business days

Biomarkers count

1

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Same-Day Appointments

UKAS Accredited Labs

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Under 18? Patients under 18 can only be seen at GB Medlabs and Clinilabs, Monday to Friday only.

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Details about Potassium

How It Works

Simple steps to get your results

1

Book Online

Choose your test online and book in seconds. Select your preferred clinic location or home visit option.

2

Visit or Test at Home

Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.

3

Get Your Results

Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.

Take control of your health with London Blood Tests

How to Prepare for Your Test

Follow these guidelines for accurate results

Sample Timing

Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.

Fasting & Hydration

Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.

Medications & Supplements

Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.

Hormones & Menstrual Cycle

For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.

If you have any questions or special circumstances, our team is happy to advise before your appointment.

Frequently Asked Questions

It measures the level of potassium, an essential electrolyte, in the blood.

It helps regulate the electrical signals that control heart rhythm.

Yes, impaired kidneys may struggle to remove excess potassium.

Yes, diuretics and some blood pressure drugs can change levels.

Yes, fluid imbalance can alter potassium concentration.

Yes, low levels commonly cause muscle cramps or weakness.

Yes, it is usually assessed alongside sodium and chloride.

Yes, intake from foods and supplements can affect results.

It is relatively common in people with kidney or heart conditions.

When symptoms, medications, or chronic conditions affect electrolyte balance.