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Midazolam Concentration in Serum/Plasma (Quantitative)

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

This test measures the amount of midazolam, a medication used to induce sedation or anesthesia, in your blood. It helps assess drug levels after administration.

Quick summary

["This test helps doctors monitor how much midazolam is in your system for safe dosing and management."]

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

Key facts at a glance

LOINC
73269-3
Short code
Midazolam ind plt IgG SerPl Ql FC
Synonyms
Midazolam ind plt IgG 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 Is Done

Your healthcare provider may order this test if you’ve received midazolam for medical procedures, surgery, or sedation. It helps ensure the medication is working at the right level and to avoid side effects like excessive drowsiness or breathing problems.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or vein to draw blood. If you’re receiving midazolam, your blood sample will be taken at different times to track levels.

What the Test Results Mean

Results show how much midazolam is present in your blood at the time of testing. Higher-than-normal levels may indicate overdose or improper dosing, while lower levels might mean the medication isn’t working as expected.

Possible Side Effects or Risks

Midazolam is generally safe when used properly, but blood tests help prevent risks like too much sedation. Rarely, abnormal levels could affect breathing or heart rhythm.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Midazolam levels are critical for patients undergoing procedures requiring sedation. Abnormal concentrations can lead to respiratory depression, prolonged sedation, or inadequate pain control. This test ensures therapeutic drug monitoring (TDM) is achieved, balancing efficacy with safety.

Short name

Midazolam Level

Frequently asked questions

When might I need this test?
You may need this test if you’ve received midazolam for procedures like surgery, dental work, or sedation in a hospital setting. Your doctor will determine if monitoring is necessary based on your medical history and treatment plan.
How soon will I get my results?
Results are typically available within 1–3 business days, depending on lab processing times. Your healthcare provider will discuss them with you during your follow-up visit.
Can I eat or drink before this test?
You can eat and drink normally before the test unless instructed otherwise by your doctor. Blood is drawn from a vein, so fasting isn’t required.
  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