Lab test

Potassium Lab Test - Aldosteronism Test

A random urine potassium test measures the amount of potassium in a single urine sample.

Typical price

From $37

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

A random urine potassium test measures the amount of potassium in a single urine sample. Potassium is an electrolyte important for nerve, muscle, and heart function, and how much appears in urine reflects how the kidneys handle it. Clinicians order it, often alongside a blood potassium level and urine creatinine, to help evaluate conditions such as aldosteronism and to investigate causes of potassium imbalance.

• Urine potassium The amount of potassium excreted in a single urine sample, reflecting kidney handling of this electrolyte.
• Urine creatinine Often measured alongside to normalize the potassium result for urine concentration.

• People being evaluated for aldosteronism.
• Individuals with abnormal blood potassium levels.
• Those with high blood pressure that is difficult to control.
• People with dehydration, vomiting, or diarrhea.
• Anyone whose provider suspects a kidney-related electrolyte imbalance.

• No fasting is required for a random urine potassium test.
• A clean-catch midstream sample is usually requested.
• Follow any medication instructions from the provider.
• Stay normally hydrated unless told otherwise.
• Provide a blood sample at the same time if the provider requests it.

Urine potassium is interpreted together with blood potassium, urine creatinine, and the clinical situation. A low or high urine potassium can help indicate whether the kidneys are retaining or losing potassium and may support evaluation of conditions such as aldosteronism. Results from a random sample are a snapshot and may be compared with a timed collection. Discuss the findings with a healthcare provider.

• Alabama
• Alaska
• Arizona
• Arkansas
• California
• Colorado
• Connecticut
• Delaware
• Florida
• Georgia