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Zalcitabine (Serum/Plasma Mass Concentration)

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

This test measures the amount of the antiviral medication zalcitabine in your blood. It helps monitor drug levels to ensure proper dosing and avoid potential toxicity.

Quick summary

["This test checks how much of your antiviral medication is in your blood."]

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

Key facts at a glance

LOINC
29125-2
Short code
Zalcitabine SerPl-aCnc
Synonyms
Zalcitabine SerPl-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 taking zalcitabine to treat conditions like HIV or certain cancers. It helps determine whether your medication levels are within safe and effective ranges.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw blood. It usually takes a few minutes, and you may feel a brief pinch.

What the Results Mean

Results are used to adjust your medication dose if needed. Low levels may indicate insufficient treatment, while high levels could signal toxicity. Your provider will interpret results based on your specific situation.

Common Reasons for Testing

This test is typically done during regular follow-ups to ensure your antiviral therapy is working effectively and to prevent side effects like kidney damage or nerve issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Zalcitabine is an antiviral medication used to treat HIV and certain cancers. Monitoring its levels helps prevent toxicity and optimize treatment effectiveness. Abnormally high or low levels may require dose adjustments or further medical evaluation.

Short name

Zalcitabine Level

Frequently asked questions

When might I need this test?
You may need this test if you’re taking zalcitabine for HIV or cancer treatment, or if your provider wants to check your drug levels during therapy.
What does a ‘normal’ result mean?
A ‘normal’ result doesn’t mean the test is unimportant—it simply means your levels fall within a range that hasn’t been linked to clear side effects or treatment failure. Your provider will discuss what these results mean for your care.
Can I eat or drink before this test?
You can eat and drink normally before the test, as no special diet or 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