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Serum or plasma electrolytes and metabolic panel (with specific focus on potassium, sodium, chloride, bicarbonate, and creatinine)

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

This test measures key chemicals in your blood that help regulate your body’s balance of fluids, electrolytes, and waste products. It’s often used to check how well your kidneys and heart are working.

Quick summary

["A BMP helps detect imbalances that could affect your heart, kidneys, or muscles, and guides treatment for conditions like dehydration, high blood pressure, or kidney disease."]

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

Key facts at a glance

LOINC
88744-8
Short code
inv(2)(EML4,ALK) Tiss Ql
Synonyms
inv(2)(EML4,ALK) Tiss Ql
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
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

Your blood sample will be tested for several important substances, including sodium, potassium, chloride, bicarbonate (a key buffer in your blood), and creatinine (a waste product filtered by your kidneys). These measurements help assess fluid balance, electrolyte levels, and kidney function.

Why It Matters in Your Health

Abnormal levels of these chemicals can cause symptoms like muscle weakness, confusion, irregular heartbeat, or signs of kidney problems. Your doctor may order this test to monitor chronic conditions, diagnose illnesses, or respond to symptoms like nausea, fatigue, or changes in urine output.

Common Uses and When It’s Ordered

Doctors often request a BMP during routine check-ups, when you have symptoms like thirst, excessive urination, or signs of dehydration. It’s also used in emergency settings to quickly assess life-threatening conditions, such as severe dehydration, heart problems, or kidney failure.

Sample Collection and Preparation

A blood sample is drawn from a vein, usually in your arm. You may feel a small pinch, but it’s a quick and painless procedure. No special preparation is needed, but avoid eating or drinking anything (except water) for 8 hours before the test if instructed by your doctor.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Basic Metabolic Panel (BMP) with electrolytes and kidney function

Frequently asked questions

How can abnormal results affect my health?
Low sodium (hyponatremia) or high sodium (hypernatremia) can cause confusion, headaches, or even seizures. Low potassium (hypokalemia) may lead to muscle weakness or irregular heartbeat, while high potassium (hyperkalemia) can be dangerous and requires immediate medical attention. Kidney problems, indicated by elevated creatinine, may signal impaired filtering of waste products, which can affect overall health over time.
What should I expect during or after the test?
The blood draw typically takes a few minutes. You may experience mild discomfort, but most people feel fine afterward. If you have a hard time sitting still, let your healthcare provider know so they can use a different vein. Rarely, you might have a bruise or slight swelling at the site, but this usually goes away quickly.
Do I need to take any special steps before or after the test?
If you’re on certain medications (like diuretics or potassium supplements), let your doctor know beforehand. Avoid strenuous activity or eating heavy meals right before the test. Once results are back, your doctor will discuss them with you and explain any follow-up steps, if needed.
  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