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Rubidium in Serum (Mass Concentration)

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

This test measures the amount of rubidium, a trace mineral, in your blood serum. It may be used to assess certain metabolic or electrolyte imbalances.

Quick summary

["Rubidium levels in blood can help identify potential mineral or fluid balance issues."]

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

Key facts at a glance

LOINC
31047-4
Short code
RUBV IgM Fld-aCnc
Synonyms
RUBV IgM Fld-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 Is This Test Done?

Your healthcare provider may order this test if you have symptoms like muscle weakness, irregular heartbeat, or signs of fluid imbalance. It can also be part of broader evaluations for conditions affecting electrolyte or mineral metabolism.

What Does the Test Measure?

Rubidium is a naturally occurring mineral found in small amounts in the body. This test specifically looks at its concentration in your blood serum, which can be influenced by kidney function, certain medications, or metabolic disorders.

How Is the Test Performed?

A blood sample is drawn from a vein, usually in your arm. The sample is then sent to a lab for analysis using specialized equipment to measure rubidium levels.

What Are Possible Results?

Results are typically reported in milligrams per deciliter (mg/dL) or micrograms per milliliter (µg/mL). While reference ranges can vary by lab, abnormal results may indicate underlying health concerns that need further investigation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Serum Rubidium

Frequently asked questions

What Might Cause Abnormal Results?
Elevated rubidium levels may be linked to kidney disease, certain medications (like diuretics), or metabolic disorders. Low levels might suggest dehydration, mineral deficiencies, or other metabolic disturbances. Always discuss results with your healthcare provider.
How Long Does It Take to Get Results?
Test results are usually available within 1 to 3 business days, depending on your lab’s processing times.
Can I Eat or Drink Before This Test?
For this test, you may need to fast or avoid certain foods/drinks for a specified period, depending on lab instructions. Follow your provider’s guidance to ensure accurate results.
  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