72281-9
LaboratoryDays in therapeutic INR range/Days INR result determined [Ratio]
Definition
Therapeutic INR range (TTR) is a way of summarizing international normalized ratio (INR) control over time. This term identifies a patient's TTR when the Rosendaal method is used. The Rosendaal method uses linear interpolation to assign an INR value to each day between successive observed INR values. Gaps of greater than 56 days between INR values are not interpolated. After interpolation, the percentage of time during which the interpolated INR values lie within the target therapeutic range is calculated. The formula for TTR for a patient is: [Number of days that a patient's interpolated INR result is in therapeutic range] / [Number of days for which the patient has an interpolated INR result]. (See http://www.qualitymeasures.ahrq.gov/content.aspx?id=32739)
LOINC 6-Axis Classification
Component
Days in therapeutic INR range/Days INR result determined
Property
Ratio
Time Aspect
Pt
System
^Patient
Scale Type
Qn
Method Type
N/A
Details
Class
H&P.HX.LAB
Order/Observation
Both
Short Name
Ds INR range/Ds INR det Patient-Rto
Display Name
Days in therapeutic INR range/Days INR result determined [Ratio]
Related Names
Frequently Asked Questions
What is LOINC code 72281-9?
LOINC code 72281-9 identifies "Days in therapeutic INR range/Days INR result determined [Ratio]". Therapeutic INR range (TTR) is a way of summarizing international normalized ratio (INR) control over time. This term identifies a patient's TTR when the Rosendaal method is used. The Rosendaal method uses linear interpolation to assign an INR value to each day between successive observed INR values. Gaps of greater than 56 days between INR values are not interpolated. After interpolation, the percentage of time during which the interpolated INR values lie within the target therapeutic range is calculated. The formula for TTR for a patient is: [Number of days that a patient's interpolated INR result is in therapeutic range] / [Number of days for which the patient has an interpolated INR result]. (See http://www.qualitymeasures.ahrq.gov/content.aspx?id=32739)
What does 72281-9 measure?
This code measures Days in therapeutic INR range/Days INR result determined in ^Patient. It belongs to the H&P.HX.LAB class in the LOINC classification.
What is LOINC?
LOINC (Logical Observation Identifiers Names and Codes) is a universal standard for identifying laboratory and clinical observations. It is maintained by the Regenstrief Institute and used worldwide for health data exchange.