Skip to content

Lorazepam concentration in plasma

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

This test measures the amount of the medication lorazepam in your blood plasma. It helps assess your current dose level and response to treatment.

Quick summary

["This test helps doctors check how much lorazepam is in your system for treatment monitoring."]

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

Key facts at a glance

LOINC
73294-1
Short code
LORazepam ind plt IgM SerPl Ql FC
Synonyms
LORazepam 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 Is This Test Done?

Your healthcare provider may order this test if you’re taking lorazepam (a benzodiazepine) for anxiety, seizures, or sleep disorders. It helps determine if your dose is appropriate, whether you’re experiencing side effects, or if your body is processing the medication effectively.

What Does the Result Mean?

Results are not provided with specific numeric ranges since they depend on your individual dose, metabolism, and medical condition. Your doctor will interpret the result in relation to your treatment plan.

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 a blood sample. This is usually done in a clinic or lab.

What Happens During the Test?

A healthcare professional will collect a blood sample from your arm. The sample is then sent to a lab for testing using a specialized method to measure lorazepam levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Lorazepam levels can indicate whether your medication is working as intended. High levels may suggest overdose or improper metabolism, while low levels could mean insufficient dosing or rapid clearance from your system. Your doctor will use these results to adjust your treatment plan.

Short name

Lorazepam Level

Frequently asked questions

Why might my lorazepam level be checked regularly?
Regular checks are often done if you’re taking lorazepam long-term, have complex medical conditions, or if you’re at risk of drug interactions. It helps ensure safety and effectiveness of your treatment.
What are common reasons for abnormal lorazepam levels?
Abnormal levels may occur due to changes in dose, liver or kidney issues affecting metabolism, alcohol use, or other medications that interact with lorazepam. Always discuss any concerns with your doctor.
Can I eat or drink before this test?
You can eat and drink normally before the test unless your doctor instructs otherwise. No fasting is 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