Sodium blood test
What is a Sodium Blood Test?
The sodium blood test measures the amount of sodium in the bloodstream. It is used to help diagnose conditions related to an abnormally high or low sodium level such as dehydration, Addison’s disease, and congestive heart failure. It can also help evaluate the effects of certain medications, check electrolyte levels, and determine a person’s risk for developing hypertension and other health issues.
Preparation for a Sodium Blood Test
Your doctor will typically advise you to fast for eight to 12 hours prior to the test. This means that you should avoid eating or drinking anything except water during this time. However, in some cases your doctor might also ask you to collect a urine sample for testing prior to the blood draw.
Procedure for the Sodium Blood Test
The sodium test involves taking a single blood sample from a vein in your arm. The sample is then sent to a lab for testing. Before the test, a healthcare professional will wrap an elastic band (tourniquet) around your upper arm. This will help the vein in your arm swell up, making it easier to insert the syringe.
Types of Sodium Blood Tests
There are two main types of sodium tests: serum sodium tests and whole blood sodium tests. The serum sodium test measures the amount of sodium in the liquid part of the blood. The whole blood sodium test measures both the liquid and solid parts of the blood. The results of the tests are almost always the same.
Risks Involved in a Sodium Blood Test
Having a sodium blood test is generally a safe and painless procedure with very few risks. The most common risk associated with the test is discomfort at the site of the injection. In addition, some people may feel a slight sting when the syringe is inserted into the vein. Bacterial infections are rare but can occur if proper procedures are not followed.
Why Have a Sodium Blood Test?
Sodium is an electrolyte needed for proper nerve and muscle function. It helps regulate the amount of water in the body and helps maintain the balance of acid and base in the blood. An abnormally low or high sodium level can indicate a variety of medical problems, including kidney and heart diseases, electrolyte disorders, endocrine issues, and certain types of cancer.
When to Have a Sodium Blood Test?
A healthcare professional may recommend a sodium blood test if you are experiencing symptoms of abnormal sodium levels such as weakness, confusion, loss of appetite, fever, nausea, vomiting, or extreme thirst. It can also be used to monitor the effectiveness of certain medications or treatments. In addition, your doctor may periodically check your sodium levels as part of a routine medical checkup.
