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LOINC Code 65364-2: Cortisol Free/Total cortisol [Mass fraction]

65364-2 is a LOINC code used to identify Cortisol Free/Total cortisol [Mass fraction] 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 Cortisol.free/Cortisol.total. 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 Cortisol.free/Cortisol.total. 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: Both

What it does not mean

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

Key facts

  • Cortisol Free/Cortisol.total in Serum or Plasma
  • Cortisol.free/Cortisol.total
  • 17-Hydroxycorticosterone; Chemistry; Compound F; Coritsol; Cort; Cortis F; F; FR; hydrocortisone; Mass fraction; Non-protein bound; Percent; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Tot; Totl

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

Cortisol Free/Total cortisol [Mass fraction]Cortisol Free/Cortisol.total in Serum or PlasmaCortis F/Total MFr SerPlCortisol.free/Cortisol.totalCHEMFree cortisol/Total Cortisol, BloodMFr

Frequently asked questions

Code details

Code65364-2
SystemLOINC
Display nameCortisol Free/Total cortisol [Mass fraction]
DescriptionCortisol.free/Cortisol.total
Short nameCortis F/Total MFr SerPl
ComponentCortisol.free/Cortisol.total
PropertyMFr
TimingPt
System (specimen)Ser/Plas
ScaleQn
ClassCHEM
Example units%
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.36
Last changed2.73

Consumer names

Free cortisol/Total Cortisol, Blood

Part names

Cortisol.free/Cortisol.totalMFrPtSer/PlasQnMass fractionPoint 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.