Midwest · Potassium Lab Test – Aldosteronism Test
Potassium Lab Test – Aldosteronism Test in Missouri
Potassium Lab Test – Aldosteronism Test can be ordered without a referral from your own doctor, and this guide covers what to expect. A potassium urine test measures how much potassium is in your urine and can help evaluate conditions related to aldosteronism.
Lab requirements in Missouri
Here is what you need before ordering and completing the Potassium Lab Test – Aldosteronism Test in MO. Review each item and confirm the details with the collection lab.
- Physician's order
- Included. A physician's order is required for lab testing and is provided for you by our partner's physicians — no referral from your own doctor is needed.
- Fasting
- Some tests require fasting or avoiding certain foods or drinks beforehand. You will be informed when you order — confirm the details with the collection lab.
- Preparation
- Preparation may vary depending on the specific test and the lab performing it. Always follow the instructions provided by the collection lab.
- Sample & visit
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Identification
- Bring the lab requisition form from your account. The collection lab may also ask for a government-issued photo ID.
- Turnaround
- 1-3 business days
- Availability
- Our partner lab does not serve ND, RI, NY, NJ, MD or HI. Confirm availability for your location with the collection lab.
Before you go
- Order your test before visiting a lab, then use the requisition form in your account.
- Print the requisition form, or fax it to the lab directly from your account.
- No scheduling is needed — visit the collection lab during its normal business hours.
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Bring a government-issued photo ID in case the lab requests it.
- Results are posted to your secure account within 1–3 business days.
Requirements are summarized from our partner lab's published policies. Preparation and availability can change — confirm current instructions with the collection lab before your visit.
What this test is
This test measures the amount of potassium in a urine sample. It is often used along with other tests to help diagnose aldosteronism, a condition where the adrenal glands produce too much aldosterone. Potassium is an important electrolyte that helps nerves and muscles work properly.
What it measures
- Potassium — reflects the amount of potassium excreted in urine
- Aldosterone — sometimes measured alongside to assess adrenal function
- Creatinine — often included to help interpret potassium excretion
What the test involves
You will collect a urine sample, usually over a 24-hour period or as a single random sample, depending on the lab's instructions. The sample is then sent to a laboratory for analysis.
Why it is often ordered
A clinician may order this test if they suspect an electrolyte imbalance or a hormone-related condition such as aldosteronism. It can also be used to monitor certain conditions that affect potassium levels, like dehydration or digestive disorders.
Preparation
Preparation may vary depending on the specific test and the lab performing it. Always follow the instructions provided by the collection lab.
How results are reported
Results are typically reported as a concentration of potassium in the urine, and reference ranges vary by laboratory. Your clinician will interpret the results in the context of your overall health and other tests.
Before you go
- Whether you need to collect a 24-hour urine sample or a random sample
- Any dietary or medication restrictions before the test
- The specific instructions for sample collection and storage
Cities
Potassium Lab Test – Aldosteronism Test in Missouri communities
Choose your city for local context and to order this test.