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Rubidium Serum Concentration (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 in specific clinical evaluations, such as assessing fluid balance or detecting certain metabolic conditions.

Quick summary

["Rubidium levels help doctors understand how your body handles fluids and electrolytes."]

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

Key facts at a glance

LOINC
49107-6
Short code
RUBV IgM Titr Ser
Synonyms
RUBV IgM Titr Ser
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 This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like unusual fluid retention, swelling, or if you’re being evaluated for conditions affecting electrolyte balance, such as certain kidney or heart issues. It can also be part of broader metabolic or diagnostic workups.

What to Expect Before the Test

No special preparation is typically needed. You may be asked to fast for a few hours before the test, but this depends on your doctor’s instructions. Bring any medications or supplements you’re taking to your appointment.

How the Test Is Performed

A blood sample will be drawn from a vein, usually in your arm, by a healthcare professional. The sample is then sent to a lab for analysis.

What the Results Mean

Rubidium levels are not commonly used for routine screening. Abnormal results may indicate imbalances in fluid or electrolyte levels, which could signal underlying health concerns requiring further medical evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Rubidium Level

Frequently asked questions

What causes rubidium levels to be tested?
Rubidium testing is rarely routine but may be ordered during specialized evaluations, such as assessing fluid retention, diagnosing electrolyte imbalances, or investigating unexplained symptoms related to kidney or heart function.
How long does it take to get results?
Test results are typically available within 1–3 business days, depending on your lab’s processing time.
Can I eat or drink before this test?
Follow your doctor’s instructions—some tests require fasting, while others do not. Always confirm with your healthcare provider before the appointment.
  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