Skip to content

Loratadine Quantitative Serum Concentration

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 serum. It helps assess whether your dose is appropriate for your needs.

Quick summary

["Check if your allergy medication is working at the right level in your body."]

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

Key facts at a glance

LOINC
72999-6
Short code
Loratadine (neut) IgM SerPl Ql FC
Synonyms
Loratadine (neut) IgM 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 ensure the medication is providing the expected effects. It may also be used to monitor for potential side effects or adjust your dose if needed.

What to Expect Before the Test

No special preparation is usually required. You may fast before the test if instructed, but your provider will confirm. Bring a list of all medications, including over-the-counter drugs and supplements, to share with your doctor.

What Happens During the Test

A healthcare professional will draw blood from a vein in your arm. The blood sample is sent to a lab for analysis using an immunoassay method to measure loratadine levels.

What the Results Mean

Results are typically reported as a concentration value (e.g., micrograms per liter). Your provider will interpret the result in relation to your clinical picture and medication goals. For example, therapeutic levels may fall within a specific range, but individual needs vary.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Loratadine Level

Frequently asked questions

What does loratadine mean in my results?
Loratadine levels help determine if your dose is too high or too low. High levels might indicate overdose or improper metabolism, while low levels could mean the medication isn’t working as intended. Your provider will discuss these findings with you during your follow-up.
Can I eat or drink before this test?
Generally, you can eat and drink normally unless your provider specifies otherwise. Some tests require fasting, but loratadine levels are stable regardless of food intake, so no special diet is needed.
How long will it take to get my results?
Results are usually available within 1 to 3 business days, depending on your lab’s processing time. Your provider will contact you with the findings once they’re ready.
  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