Osmolality (blood)

This is an important test that is typically used to diagnose hyponatremia.

Venous blood
1 tests included
2 days turnaround



About Osmolality (blood)

What is an osmolality blood test?

Osmolality is a measure of the concentration of a substance that is dissolved in another. In the blood, osmolality is constantly adjusted, affecting processes such as how often you urinate.

The osmolality test is usually used to diagnose the amount of sodium in the blood. Low blood sodium (low osmolality) is referred to as hyponatremia, producing symptoms including headaches, nausea, vomiting, weakness and low energy, seizures and in extreme cases a coma.

Why take the test?

This test measures the osmolality of the blood serum. It is typically used to diagnose hyponatremia.


What's tested


How it works



Purchase your Kit

Just order a test online and get your kit delivered right to your door unless you are ordering a COVID-19 Fit to Fly test where you will be given appointment options to attend our clinics across the United Kingdom for a nose and throat swab PCR test at the checkout stage.



Take your test and post

Follow our simple instructions to take your sample and post back the enclosed prepaid envelope to our accredited lab for processing. We also offer home or workplace visits by a qualified nurse. For COVID-19 Fit to Fly tests you must attend one of our partner clinics for our trained collection officers to take your sample. You will then have the results emailed to you.



Get results directly to your dashboard

You will receive an email notification from our medical team when your results are available on your secure personalised health dashboard.