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Zalcitabine (Pharmacokinetic Profile) – Serum Concentration

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

This test measures the amount of zalcitabine, a medication used to treat certain cancers, in your blood serum. It helps doctors monitor how well your body is processing the drug.

Quick summary

["This test helps ensure your medication is working safely and effectively."]

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

Key facts at a glance

LOINC
30301-6
Short code
Zalcitabine Susc Islt
Synonyms
Zalcitabine Susc Islt
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 Is This Test Done?

Your healthcare provider may order this test if you’re taking zalcitabine to check if your blood levels are within the recommended range. This helps prevent side effects and ensures the drug remains effective over time.

What Does This Test Involve?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it’s analyzed using a specialized immunoassay method to measure zalcitabine concentration.

What Do Results Mean?

Results are typically reported as a concentration value (e.g., micrograms per milliliter). While reference ranges vary by lab, abnormal levels may suggest either insufficient drug exposure or toxicity.

Common Reasons for Testing

This test is most commonly performed during treatment to adjust dosage if needed, especially if you experience side effects like nausea, fatigue, or changes in kidney function.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Zalcitabine Level

Frequently asked questions

What does a ‘high’ or ‘low’ zalcitabine level mean?
A high level may indicate overmedication, increasing risk of side effects like kidney problems or bone marrow suppression. A low level could mean the drug isn’t working as intended, requiring a dosage adjustment.
How often should I get this test?
Your doctor will determine timing based on your treatment plan, but tests may be done weekly or monthly during active therapy to track levels closely.
Can I eat or drink before this test?
You may eat and drink normally before the test, as it doesn’t require fasting. However, always follow your healthcare provider’s specific instructions for your 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