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Rubidium in Serum

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 can help identify potential electrolyte or mineral disturbances in your body."]

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

Key facts at a glance

LOINC
105055-8
Short code
RUBV IgG Spec Ql
Synonyms
RUBV IgG Spec Ql
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 unexplained fluid imbalances. It can also be part of broader evaluations for conditions affecting electrolyte or mineral metabolism, such as kidney disease or certain metabolic disorders.

What Does the Result Mean?

Results are not typically provided as a single reference range because rubidium is a trace mineral with minimal physiological relevance in standard clinical practice. Abnormal levels may suggest underlying issues requiring further medical evaluation.

How Is This Test Performed?

A blood sample is drawn from a vein, usually in your arm. The serum portion is then analyzed using a specialized laboratory method to measure rubidium concentration.

What Are Common Causes of Abnormal Results?

Rubidium is not commonly monitored in routine care, but elevated levels may be linked to certain medications, kidney dysfunction, or rare metabolic conditions. Low levels are less frequently associated with clinical concern.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Limited Role in Routine Care

Short name

Serum Rubidium Level

Frequently asked questions

What Does It Feel Like to Have This Test Done?
You may feel slight discomfort or bruising at the needle insertion site, but most people tolerate blood draws with minimal pain. Most patients return to normal activities immediately afterward.
How Often Can I Expect This Test?
This test is not a standard screening or monitoring test. It is typically ordered only when specific clinical circumstances suggest it may be useful, such as investigating electrolyte imbalances or metabolic disorders.
What Are the Risks or Side Effects?
The primary risks of a blood draw include mild pain, bruising, or infection at the site. There are no known long-term risks associated with rubidium testing, as it is not a routine clinical measurement.
  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