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Josamycin concentration in serum/plasma (mass concentration)

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

This test measures the amount of josamycin, an antibiotic, in your blood. It helps your healthcare provider assess how your body is responding to treatment.

Quick summary

["This test helps monitor antibiotic levels for effective dosing and safety."]

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

Key facts at a glance

LOINC
41698-2
Short code
Josamycine Islt KB
Synonyms
Josamycine Islt KB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
agar-diffusion
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 doctor may order this test if you’re taking josamycin (an antibiotic) to check if the medication is working properly. It helps ensure you’re getting the right dose and avoids potential side effects from too much or too little in your system.

How the Test Works

A blood sample is taken, usually from a vein in your arm. The sample is then analyzed using a specialized lab technique to measure josamycin levels in your serum or plasma.

What to Expect Before the Test

There are no special preparations needed. You may have some mild discomfort from the needle, but it usually goes away quickly. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Results show the amount of josamycin in your blood at the time of testing. Your doctor will compare these results to your treatment plan to adjust your dose if needed. Too high or too low levels can affect how well the medicine works or increase side effects.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Josamycin Level

Frequently asked questions

How often should I get this test?
Your doctor will determine the timing based on your treatment plan, typically during or shortly after starting josamycin, and then periodically while you’re on the medication.
What do my results mean if they’re too high or too low?
Too high levels may indicate the medicine isn’t being processed by your body well or could cause side effects like nausea or allergic reactions. Too low levels might mean the infection isn’t fully treated, so your doctor may adjust your dose.
Can I eat or drink before this test?
You can eat and drink normally before the test unless your doctor instructs otherwise. Some tests may require fasting, but this one does not.
  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