LOINCActiveObservation

LOINC Code 16616-5: Cholesterol in HDL/Cholesterol in LDL [Mass ratio]

16616-5 is a LOINC code used to identify Cholesterol in HDL/Cholesterol in LDL [Mass ratio] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Cholesterol.in HDL/Cholesterol.in LDL. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 25 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Cholesterol.in HDL/Cholesterol.in LDL. It is commonly used with the system or sample type Ser/Plas.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: ACTIVE
  • Order vs observation: Observation

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

  • Cholesterol in HDL/Cholesterol in LDL [Mass Ratio] in Serum or Plasma
  • Cholesterol.in HDL/Cholesterol.in LDL
  • Cardio; Cardiology; Chemistry; Chol; Choles; Cholest; Cholesterol total; Cholesterols; HDLc; HDL-C; Heart Disease; High density lipoprotein cholesterols; LDLc; LDL-C; Lipid; Low density lipoprotein cholesterol; Low density lipoprotein cholesterols; Mass concentration ratio; Mass ratio; MCRto; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; TCHHDL

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Cholesterol in HDL/Cholesterol in LDL [Mass ratio]Cholesterol in HDL/Cholesterol in LDL [Mass Ratio] in Serum or PlasmaHDLc/LDLc SerPlCholesterol.in HDL/Cholesterol.in LDLCHEMHDL cholesterol/LDL Cholesterol, BloodMRto

Frequently asked questions

Code details

Code16616-5
SystemLOINC
Display nameCholesterol in HDL/Cholesterol in LDL [Mass ratio]
DescriptionCholesterol.in HDL/Cholesterol.in LDL
Short nameHDLc/LDLc SerPl
ComponentCholesterol.in HDL/Cholesterol.in LDL
PropertyMRto
TimingPt
System (specimen)Ser/Plas
ScaleQn
ClassCHEM
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0l
Last changed2.73

Consumer names

HDL cholesterol/LDL Cholesterol, Blood

Part names

Cholesterol.in HDL/Cholesterol.in LDLMRtoPtSer/PlasQnMass RatioPoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.