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Serum or plasma concentration of cefadroxil (antibiotic)

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

This test measures the amount of the antibiotic cefadroxil in your blood or plasma. It helps doctors check if your dose is working properly and if you’re responding to treatment.

Quick summary

["This test helps monitor antibiotic levels to ensure effectiveness and avoid excess."]

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

Key facts at a glance

LOINC
73474-9
Short code
Cefadroxil ind plt IgM SerPl Ql FC
Synonyms
Cefadroxil ind plt IgM SerPl Ql FC
Category
hematology
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 Matters

Cefadroxil is a penicillin-type antibiotic used to treat bacterial infections. Your doctor may order this test if you’re taking cefadroxil to confirm levels are within safe ranges. Low levels might mean the drug isn’t working, while high levels could indicate side effects or improper dosing.

What to Expect Before the Test

No special preparation is needed. You may have a blood draw from a vein in your arm. If you’re on this medication, tell your healthcare provider before the test to ensure accurate results.

What the Results Mean

Results are typically reported as a concentration value (e.g., micrograms per milliliter). Your doctor will interpret these in relation to your medical condition and treatment plan. Follow-up tests may be needed if levels are outside expected ranges.

Common Reasons for Testing

Doctors may order this test if you’re taking cefadroxil for infections like skin, urinary tract, or respiratory infections. It helps track how your body processes the drug and guides adjustments to your treatment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormally low levels may suggest insufficient antibiotic exposure, potentially requiring a higher dose. High levels could indicate toxicity or improper dosing, prompting dose adjustments or alternative treatments. Always discuss results with your healthcare provider.

Short name

Cefadroxil Level

Frequently asked questions

Will I need to fast before this test?
No fasting is required for this blood test. However, inform your doctor about all medications, including over-the-counter drugs or supplements, to avoid potential interference with results.
How long will it take to get my results?
Results are usually available within 1–3 business days, depending on your lab. Your doctor will contact you with the final interpretation.
Can I stop taking cefadroxil before this test?
Do not stop taking cefadroxil without consulting your doctor. This test helps monitor your treatment. If you have questions about timing, ask your healthcare provider.
  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