Metformin Concentration in Plasma
This test measures the amount of metformin, a medication used to lower blood sugar, in your blood plasma. It helps monitor drug levels to ensure safe and effective dosing.
["This test checks how much metformin is in your blood to avoid dangerous low or high levels."]
Key facts at a glance
- LOINC
- 73286-7
- Short code
- metFORMIN ind plt IgM SerPl Ql FC
- Synonyms
- metFORMIN ind plt IgM SerPl Ql FC
- Category
- hematology
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- flow-cytometry
- 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 order this test if you’re taking metformin to manage diabetes or prediabetes. They might also check it if you’re experiencing unusual symptoms like nausea, vomiting, or signs of low blood sugar (such as shakiness or confusion).
What to Expect Before the Test
No special preparation is needed, but you may be asked to fast for a few hours before the test if instructed by your doctor. Bring a list of all medications, including over-the-counter drugs and supplements, to share with your provider.
How the Test Is Performed
A healthcare professional will draw blood from a vein in your arm using a small needle. The blood sample will be sent to a lab to measure metformin levels using a specialized method, likely immunoassay or chemiluminescent immunoassay.
What the Results Mean
Results will show the concentration of metformin in your plasma. Your doctor will compare these results to your medical history, symptoms, and other test results to determine if your dose needs adjustment. Too much metformin can be harmful, while too little may not control your blood sugar effectively.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
High metformin levels can lead to serious side effects, including metabolic acidosis (a dangerous buildup of acid in your blood), which requires immediate medical attention. Low levels may indicate poor absorption or incorrect dosing. Regular monitoring helps prevent these risks and ensures your medication works as intended.
Short name
Metformin Level
Frequently asked questions
How often should I get this test?
What do my results mean if they’re outside the normal range?
Can I eat or drink before this test?
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