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Rubidium (Serum) Concentration

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

This test measures the amount of rubidium, a trace mineral, in your serum. It may be ordered to assess electrolyte balance or evaluate conditions affecting fluid and electrolyte homeostasis.

Quick summary

["Rubidium helps regulate fluid balance and nerve function; abnormal levels may signal underlying health concerns."]

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

Key facts at a glance

LOINC
52986-7
Short code
RUBV IgG Avidity Ser IA-Rto
Synonyms
RUBV IgG Avidity Ser IA-Rto
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

Why Is This Test Done?

Your healthcare provider may recommend this test if you have symptoms like muscle weakness, irregular heartbeat, or signs of electrolyte imbalances. It could also be part of broader testing for conditions affecting kidney function, heart rhythm, or fluid retention.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if instructed. Bring any medications you’re currently taking, as some may affect results.

How the Test Is Performed

A blood sample is drawn from a vein, typically in your arm, by a healthcare professional. The serum portion is separated and analyzed for rubidium concentration using specialized laboratory techniques.

What the Results Mean

Results are compared to standard reference ranges for healthy adults. Abnormal levels may indicate conditions such as kidney disease, certain metabolic disorders, or excessive fluid shifts (e.g., dehydration or overhydration).

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 high in the blood?
High rubidium levels may result from kidney disease, excessive intake of certain medications (e.g., diuretics), or conditions causing abnormal fluid shifts (e.g., severe dehydration or heart failure). Always discuss any medications or symptoms with your provider.
What causes rubidium levels to be low in the blood?
Low rubidium levels are less common but may occur with severe kidney impairment, certain metabolic disorders, or excessive loss of fluids through vomiting, diarrhea, or diuretic use. Your provider will investigate potential causes based on your medical history and symptoms.
Can rubidium test results be affected by diet or medications?
Dietary rubidium intake is minimal and typically does not significantly impact test results. However, certain medications (e.g., potassium-sparing diuretics) may indirectly influence electrolyte balance, so inform your provider of all medications you’re taking.
  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