67709-6
LaboratoryMethylmalonylcarnitine (C4-DC)+3-Hydroxyisovalerylcarnitine (C5-OH) [Moles/volume] in DBS
Definition
This analyte is measured using the non-derivatized tandem mass spectrometry (MS/MS) method and is not measured when using the derivatized reagents. When using the derivatized reagents, it will instead be measured as two separate analytes C4-DC [LOINC: 45222-7] and C5-OH [LOINC: 50106-4]. A different LOINC code is used for the derivatized or non-derivatized method because based on the reagents used in processing, different sets of analytes become isobaric, which means that they cannot be distinguished on the MS/MS because they have the same molecular weight after reagent processing.
LOINC 6-Axis Classification
Component
Methylmalonylcarnitine (C4-DC)+3-Hydroxyisovalerylcarnitine (C5-OH)
Property
SCnc
Time Aspect
Pt
System
Bld.dot
Scale Type
Qn
Method Type
N/A
Details
Class
CHEM
Order/Observation
Both
Short Name
C4-DC+C5-OH DBS-sCnc
Display Name
C4-DC+C5-OH (DBS) [Moles/Vol]
Related Names
Frequently Asked Questions
What is LOINC code 67709-6?
LOINC code 67709-6 identifies "Methylmalonylcarnitine (C4-DC)+3-Hydroxyisovalerylcarnitine (C5-OH) [Moles/volume] in DBS". This analyte is measured using the non-derivatized tandem mass spectrometry (MS/MS) method and is not measured when using the derivatized reagents. When using the derivatized reagents, it will instead be measured as two separate analytes C4-DC [LOINC: 45222-7] and C5-OH [LOINC: 50106-4]. A different LOINC code is used for the derivatized or non-derivatized method because based on the reagents used in processing, different sets of analytes become isobaric, which means that they cannot be distinguished on the MS/MS because they have the same molecular weight after reagent processing.
What does 67709-6 measure?
This code measures Methylmalonylcarnitine (C4-DC)+3-Hydroxyisovalerylcarnitine (C5-OH) in Bld.dot. It belongs to the CHEM 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.