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Serum electrolytes panel with lactate

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

This test measures key minerals in your blood (electrolytes) and a substance called lactate, which helps your body use energy.

Quick summary

["Helps assess fluid balance, kidney function, and metabolic health."]

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

Key facts at a glance

LOINC
99548-0
Short code
Gas + Electrolytes Pnl BldA
Synonyms
Gas + Electrolytes Pnl BldA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
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 Are Electrolytes?

Electrolytes like sodium, potassium, chloride, and bicarbonate are vital for balancing fluids in your body, supporting nerve and muscle function, and maintaining acid-base balance. Abnormal levels can cause symptoms like confusion, irregular heartbeat, or muscle weakness.

How Is Lactate Measured?

Lactate is a byproduct of energy production in your cells. High levels may indicate conditions like poor circulation, heart problems, or infections. Your doctor may order this test if you’re experiencing fatigue, shortness of breath, or other signs of low oxygen or metabolic stress.

Why Might This Test Be Ordered?

Your healthcare provider may recommend this test to check for dehydration, kidney issues, heart problems, or metabolic disorders. It’s also used in emergency settings to monitor patients with conditions like sepsis, shock, or severe infections.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw blood. If you’re on a fluid restriction, follow your doctor’s instructions carefully.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Electrolytes + Lactate

Frequently asked questions

Why do I need this test?
Your doctor may order this test to check if your body’s fluid balance, kidney function, or energy production is working properly, especially if you have symptoms like dizziness, rapid heartbeat, or unexplained fatigue.
What could cause abnormal results?
High or low electrolyte levels can result from dehydration, kidney disease, heart problems, or certain medications. High lactate levels may occur with infections, heart failure, or conditions that reduce blood flow to tissues.
Do I need to avoid certain foods or drinks before the test?
No special diet is required, but if your doctor mentions fluid restrictions, follow their advice to avoid dehydration.
  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