Rubidium concentration in serum/plasma
This test measures the amount of rubidium, a trace mineral, in your blood. It may be used to assess certain metabolic or electrolyte imbalances.
["Rubidium levels can help identify underlying health conditions affecting fluid balance or mineral metabolism."]
Key facts at a glance
- LOINC
- 13282-9
- Short code
- RUBV IgM CSF-aCnc
- Synonyms
- RUBV IgM CSF-aCnc
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Your healthcare provider may order this test if you have symptoms like unusual thirst, swelling, or signs of electrolyte disturbances. It could also be part of a broader evaluation for conditions like kidney disease, heart failure, or certain metabolic disorders.
What to Expect Before the Test
No special preparation is typically required. You may be asked to fast for a few hours before the blood draw, but this depends on your provider’s instructions. Wear comfortable clothing and plan to stay near the testing site for a short time.
How the Test Is Performed
A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood sample is then sent to a lab for analysis.
What the Results Mean
Rubidium levels are not commonly used for routine screening, and reference ranges can vary by lab. Abnormal results may prompt further testing or evaluation of your symptoms and medical history.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Serum Rubidium Level
Frequently asked questions
Rubidium is a trace mineral that plays a role in fluid balance and nerve function. Elevated levels may suggest conditions like kidney dysfunction or excessive fluid retention, while very low levels could indicate metabolic disturbances or certain medications affecting electrolyte balance. Always discuss results with your provider.
Generally, no special diet or medication restrictions apply. However, follow your healthcare provider’s instructions if they specify fasting or timing around medications. Some tests may require avoiding certain foods or supplements that could interfere with results.
Test results are typically available within 1–3 business days, depending on your lab’s processing time. Your provider will contact you once the results are ready, usually through a secure messaging system or phone call.
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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