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Loratadine Quantitative Measurement (Serum/Plasma)

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

This test measures the amount of loratadine, a medication used to relieve symptoms of allergies, in your blood.

Quick summary

["Knowing your loratadine level helps ensure you’re taking the right dose for your condition."]

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

Key facts at a glance

LOINC
73000-2
Short code
Loratadine (neut) IgG SerPl Ql FC
Synonyms
Loratadine (neut) IgG SerPl Ql FC
Category
chemistry
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 Is Done

Your healthcare provider may order this test if you’re taking loratadine (e.g., Claritin) and want to check if your blood levels are within the expected range. It can also help monitor for side effects or adjust your dose if needed.

What to Expect Before the Test

No special preparation is usually required. You’ll provide a blood sample, typically drawn from a vein in your arm. If you’re on other medications, let your provider know to avoid potential interactions.

What the Test Results Mean

Results are compared to a general reference range for loratadine, but individual needs vary. High levels may indicate overdose or improper metabolism, while low levels could suggest insufficient dosing. Your provider will interpret results in the context of your medical history and symptoms.

Common Reasons for Testing

This test is often used to confirm therapeutic drug levels, especially in patients with kidney or liver issues, who may need dose adjustments to avoid toxicity or ineffectiveness.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Loratadine levels help ensure proper dosing for allergy relief while minimizing risks like drowsiness or heart rhythm changes. Abnormal results may prompt adjustments to medication, lifestyle changes, or further evaluation of underlying health conditions.

Short name

Loratadine Level

Frequently asked questions

When might I need this test?
You may need this test if you’re taking loratadine long-term, have kidney or liver problems, or if your symptoms don’t improve with the current dose.
How long will it take to get my results?
Results are typically available within 1–3 business days, depending on your lab’s processing time.
Can I stop taking loratadine if my levels are low?
No, always follow your healthcare provider’s instructions. Low levels may mean your dose isn’t working as intended, and they’ll help determine if adjustments are needed.
  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