Skip to content

Total Treatment Time Ends (Serum/Plasma Concentration) – Calculated Index

Published: August 9, 2026Updated: August 17, 2026

This test is a calculated index derived from your blood test results to evaluate how long your body takes to clear a specific medication or substance from your system.

Quick summary

["Understanding how quickly your body processes medications can help doctors tailor your treatment plan."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
111876-9
Short code
Total treatment time Endscpy
Synonyms
Total treatment time Endscpy
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
7
Ref high
56
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
endoscopy
CPT
84484
SNOMED
302773008
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

What This Test Measures

The test calculates a metric based on the concentration of a medication or substance in your blood over time. It helps determine the timeframe from when you last took the medication until its levels drop to nearly zero in your bloodstream.

Why It’s Ordered

Your healthcare provider may order this test if you’re on long-term medication, particularly those metabolized by the liver or kidneys, to ensure proper dosing and avoid buildup that could cause side effects.

Common Uses

This index is often used in pharmacokinetics studies to assess drug clearance in patients with varying liver or kidney function, or to optimize dosing in specific medical conditions (e.g., heart failure, liver disease).

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The sample is processed into either serum (after clotting) or plasma (anticoagulated) and sent to a lab for analysis. This test does not require fasting unless specified by your provider.

Reference range

Adult males: 7-56 U/L; Adult females: 7-43 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

None

Frequently asked questions

What does a high or low result mean?
This test result is not a standalone diagnostic tool but rather a calculated value used alongside other clinical data. Your healthcare provider will interpret it in the context of your overall health, medication history, and other lab results to guide treatment decisions.
Is fasting required for this test?
No fasting is typically required unless your provider specifies otherwise. Blood is drawn at a convenient time for you, and the test focuses on the substance’s concentration over time rather than a single measurement.
How often will I need this test?
The frequency depends on your treatment plan. Some patients may need this test periodically to monitor medication effectiveness or adjust doses, while others may only need it once during initial evaluation or follow-up.
  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 17, 2026. · Read our editorial policy