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Fluconazole Concentration in Plasma

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

This test measures the amount of the antifungal medication fluconazole in your blood plasma. It helps doctors monitor your dose and ensure it stays within safe levels.

Quick summary

["Fluconazole levels help prevent dangerous drug buildup and ensure the medication works effectively against infections."]

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

Key facts at a glance

LOINC
88200-1
Short code
FLUV Corn/Cnjt Cult
Synonyms
FLUV Corn/Cnjt Cult
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
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 doctor may order this test if you’re taking fluconazole to treat or prevent fungal infections, such as candidiasis. It helps assess whether your dose is appropriate for your weight, kidney function, and overall health.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. The process is quick and typically painless.

How the Test Works

A lab technician uses a specialized method to measure fluconazole in your plasma. This helps determine whether your medication levels are therapeutic or if adjustments are needed.

Possible Results and Next Steps

Results are compared to your specific dose and medical needs. If levels are too low, your doctor may increase your medication. If levels are too high, they may adjust your dose or monitor closely.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Fluconazole levels are critical for patients with kidney issues, those on other medications, or those with weakened immune systems. Uncontrolled levels can lead to infections persisting or drug toxicity, so regular monitoring is key.

Short name

Fluconazole Level

Frequently asked questions

When might I need this test?
You may need this test if you’re taking fluconazole for fungal infections, have kidney problems, or are taking other medications that could interact with fluconazole.
How often will I need this test?
Your doctor will determine the frequency based on your treatment plan, dose, and health status. It may be done weekly or monthly, depending on your situation.
What happens if my fluconazole level is too high or too low?
If levels are too high, your doctor may reduce your dose or switch medications. If levels are too low, they may increase your dose or check for other issues, like poor absorption.
  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