Skip to content

Rubidium concentration 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 underlying conditions affecting fluid balance or mineral metabolism."]

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

Key facts at a glance

LOINC
69765-6
Short code
RUBV IgM Fld Ql IA
Synonyms
RUBV IgM Fld Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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

What Is Rubidium Used For in the Body?

Rubidium is a naturally occurring mineral that plays a minor role in maintaining fluid balance and nerve function. While not as well-studied as other electrolytes, abnormal levels may suggest conditions like kidney dysfunction or certain metabolic disorders.

How Is This Test Performed?

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

When Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like unusual thirst, swelling, or signs of electrolyte imbalance, or if you’re being evaluated for conditions like kidney disease or metabolic disorders.

What Are Possible Results?

Results are expressed in milligrams per deciliter (mg/dL) or micrograms per milliliter (µg/mL). Interpretation depends on clinical context and may require comparison to your overall health status.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Rubidium

Frequently asked questions

Why might my rubidium test be ordered?
Your provider may request this test if you have symptoms like excessive thirst, swelling, or if you’re being evaluated for conditions affecting electrolyte balance, kidney function, or metabolic health.
What do my rubidium test results mean?
Results are compared to your clinical picture, not standalone reference ranges. Abnormal levels may prompt further testing or adjustments to medications affecting fluid or electrolyte balance.
Can I eat or drink before this test?
Typically, no special preparation is needed, but follow your healthcare provider’s instructions. Avoid excessive salt or fluids if directed, as they may affect electrolyte levels.
  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