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Rubidium concentration in serum/plasma

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

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

Quick summary

["Rubidium levels can help identify unusual mineral or fluid shifts in your body."]

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

Key facts at a glance

LOINC
46110-3
Short code
RUBV IgG Titr CSF
Synonyms
RUBV IgG Titr CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Ref low
8
Ref high
61
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82977
SNOMED
3110003
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What Is Rubidium Used For in the Body?

Rubidium is a naturally occurring element that plays a minor role in human physiology. It helps balance electrolytes and can be measured to detect conditions affecting fluid or mineral distribution, such as kidney function or certain metabolic disorders.

Why Might Your Doctor Order This Test?

Your doctor may request this test if they suspect electrolyte imbalances, kidney issues, or other metabolic problems. It can also be part of a broader evaluation for conditions like hyperaldosteronism or certain cardiac or neurological disorders.

How Is This 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 a specialized method to measure rubidium concentration.

What Do Results Mean?

Results are typically expressed in milligrams per deciliter (mg/dL) or micrograms per deciliter (µg/dL). Abnormal levels may indicate underlying health concerns that require further medical evaluation.

Reference range

Adult males: 8-61 U/L; Adult females: 5-36 U/LN/A

Specimen: csf

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Rubidium

Frequently asked questions

Why is rubidium testing done, and what conditions might it help diagnose?
Rubidium testing is less common and primarily used when other tests suggest electrolyte or metabolic imbalances. It may help diagnose conditions like hyperkalemia (high potassium) or other electrolyte disorders, though it is not a standard first-line test.
How long does it take to get results from this test?
Results are usually available within 1 to 3 business days, depending on your lab’s processing time.
Can I eat or drink anything before this test?
No special preparation is typically required for this test. However, follow any specific instructions your healthcare provider gives you, such as fasting rules for other associated tests.
  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