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Amphoteric Drug Concentration in Plasma (e.g., for Monitoring Amphotericin B Levels)

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

This test measures the amount of amphotericin B, a medication used to treat serious fungal infections, in your blood plasma.

Quick summary

["Helps doctors monitor how well your dose of amphotericin B is working and adjust treatment as needed."]

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

Key facts at a glance

LOINC
73424-4
Short code
Amphet ind plt IgM SerPl Ql FC
Synonyms
Amphet 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 Matters

Amphotericin B is a powerful antifungal drug that can be toxic if levels are too high. Your doctor may order this test to ensure you’re receiving the right amount to treat your infection without causing harmful side effects.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw a blood sample. It usually takes a few minutes.

What the Results Mean

Results show the concentration of amphotericin B in your blood. Your doctor will compare these results to your treatment plan to guide further care.

Common Reasons for Testing

Doctors may order this test if you’re taking amphotericin B to treat infections like candidiasis (yeast infections) or cryptococcosis (a fungal infection). It helps prevent overdose or underdose.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Amphotericin B Plasma Level

Frequently asked questions

How does amphotericin B work in my body?
Amphotericin B binds to fungal cell membranes, causing them to leak essential substances. Your test measures how much is circulating in your blood to ensure therapeutic levels without toxicity.
What if my results are too high or too low?
High levels may cause kidney damage or other side effects. Low levels might mean the drug isn’t working effectively. Your doctor will adjust your dose based on these results.
Can I eat or drink before this test?
You can eat and drink normally unless instructed otherwise by your doctor. No fasting is required for this blood draw.
  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