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General Electrolyte Panel (Serum)

Published: August 9, 2026Updated: August 17, 2026

This test measures key substances in your blood that help regulate fluid balance, nerve function, and muscle contractions.

Quick summary

Essential for monitoring hydration, kidney function, and overall electrolyte health.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
64312-2
Short code
FULLTIMEADVANCEDPRACTICENURSESTAFFPOSITIONSVACANTATENDOFPERIOD
Synonyms
—
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Critical range
0.5 N/A – —
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

What This Test Measures

A general electrolyte panel typically includes sodium, potassium, chloride, bicarbonate, and sometimes calcium or magnesium. These elements are vital for maintaining proper fluid balance, nerve signaling, and muscle function in your body.

Why It’s Ordered

Your doctor may order this test if you have symptoms like excessive thirst, confusion, muscle weakness, irregular heartbeat, or signs of dehydration/overhydration. It’s also used to check kidney function, acid-base balance, and response to medications.

Common Reasons for Testing

Conditions like heart disease, kidney problems, or severe vomiting/diarrhea can disrupt electrolyte levels. This test helps diagnose or monitor these conditions early.

Sample Collection and Preparation

You’ll have a small needle inserted into your arm to draw blood. No special preparation is needed, but avoid caffeine or alcohol 24 hours before testing if instructed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

None

Frequently asked questions

Low sodium or potassium levels may cause weakness, irregular heartbeat, or confusion. High levels can lead to nausea, seizures, or heart problems. Bicarbonate levels help assess acid-base balance, which is critical for organ function.
How long does it take to get results? Results are usually available within 1–2 business days, depending on your lab.
I’m on a low-sodium diet—will this test show if I’m getting enough sodium? This test measures your current sodium levels in your blood, not dietary intake. If your levels are low, your doctor may recommend further evaluation.
Can I eat or drink before the test? Typically, you can eat normally, but avoid large amounts of salt or fluids 24 hours before if your doctor specifies otherwise.
What if my results are out of range? Your doctor will discuss your results with you and may recommend adjustments to your diet, medications, or further testing if needed.
Is this test covered by insurance? Most insurance plans cover basic electrolyte panels as part of routine or diagnostic care, but confirm with your provider for specifics.
  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 17, 2026. · Read our editorial policy