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Serum or plasma potassium concentration (qualitative probe screening)

Published: August 9, 2026Updated: August 16, 2026

This test measures whether your potassium levels are too high or too low in a blood sample. Potassium is an important mineral that helps your heart, muscles, and nerves work properly.

Quick summary

["Potassium imbalances can cause serious health risks, so this screening helps detect potential issues early."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
60631-9
Short code
Se-Go Skull XR
Synonyms
Se-Go Skull XR
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
xr-measured
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Might This Test Be Ordered?

Your doctor may order this test if you have symptoms like muscle weakness, irregular heartbeat, confusion, or excessive thirst and urination. It could also be part of routine monitoring if you have conditions like kidney disease, heart problems, or certain medications that affect potassium levels.

What to Expect Before the Test

You can eat and drink normally before this test. Avoid taking potassium supplements or certain medications (like some heart medications or diuretics) unless your doctor instructs otherwise. If you’re on dialysis, follow your doctor’s guidance for the day of testing.

During the Test

A healthcare professional will draw blood from a vein in your arm. You may feel a small pinch, but it usually takes only a few minutes. The blood sample is then sent to a lab for analysis.

What the Results Mean

This test is a screening tool, not a definitive measurement. If your results suggest an imbalance, your doctor may order additional tests or follow-up to determine the cause and next steps.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Potassium (qualitative screening)

Frequently asked questions

What causes potassium levels to change?
Potassium levels can be affected by diet (e.g., high potassium foods like bananas or spinach), certain medications (like ACE inhibitors or diuretics), kidney problems, vomiting, diarrhea, or conditions like diabetes.
How long does it take to get results?
Results are typically available within 1–2 business days, depending on your lab’s processing time. Follow-up with your doctor if you have questions or concerns about your results.
Can I eat or drink anything before this test?
Yes, you can eat and drink normally unless your doctor advises otherwise. Avoid potassium-rich foods or supplements unless directed by your healthcare provider.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy