Skip to content

Vancomycin Concentration (Serum)

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

This test measures the amount of vancomycin, a medication used to treat serious bacterial infections, in your blood. It helps doctors determine the right dose for you.

Quick summary

["This test ensures your vancomycin levels stay safe and effective."]

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

Key facts at a glance

LOINC
43706-1
Short code
CMV Anal Ql Shell Vial Cult
Synonyms
CMV Anal Ql Shell Vial 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
shell-vial-culture
CPT
86038
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 Is Done

Your healthcare provider may order this test if you’re receiving vancomycin therapy to monitor your blood levels. It’s especially important for people with kidney issues or those receiving high doses to prevent side effects like low blood pressure or kidney damage.

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, and you may feel a brief pinch.

What the Test Results Mean

Results help doctors check if your vancomycin levels are within the safe range. Too little may mean the drug isn’t working, while too much could cause harm. Your doctor will discuss these results with you.

Possible Side Effects or Risks

Common side effects from the blood draw include mild bruising, soreness, or a small bump at the injection site. Rarely, vancomycin can cause allergic reactions, so let your doctor know if you experience rash, itching, or difficulty breathing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Vancomycin Level

Frequently asked questions

What does this test help diagnose or manage?
This test helps ensure proper dosing of vancomycin to treat infections like staph or MRSA while minimizing risks. It’s critical for patients with kidney problems or those receiving high doses to avoid toxicity.
How often is this test typically repeated?
Your doctor may order this test every few days during treatment, depending on your kidney function and how your body responds to the medication. Follow their instructions closely.
Can I eat or drink before this test?
Yes, you can eat and drink normally before the test unless your doctor advises otherwise. No fasting is required.
  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