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LOINC Code 49218-1: Phosphatidylinositol/Total surfactant (Amn fld) [Mass fraction]

49218-1 is a LOINC code used to identify Phosphatidylinositol/Total surfactant (Amn fld) [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 Phosphatidylinositol/Surfactant.total. It is commonly used with the system or sample type Amnio fld.

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 Phosphatidylinositol/Surfactant.total. It is commonly used with the system or sample type Amnio fld.

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

  • Phosphatidylinositol/Surfactant.total in Amniotic fluid
  • Phosphatidylinositol/Surfactant.total
  • AF; Amn; Amn fl; Amnio; Amniotic flu; Amniotic fluid; aPI; Chemistry; Mass Fraction; Percent; Phosphatidyl Inositol; PI; Point in time; QNT; Quan; Quant; Quantitative; Random; 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

Phosphatidylinositol/Total surfactant (Amn fld) [Mass fraction]Phosphatidylinositol/Surfactant.total in Amniotic fluidPI MFr AmnPhosphatidylinositol/Surfactant.totalCHEMPhosphatidylinositol/Surfactant.total, Amniotic fluidMFr

Frequently asked questions

Code details

Code49218-1
SystemLOINC
Display namePhosphatidylinositol/Total surfactant (Amn fld) [Mass fraction]
DescriptionPhosphatidylinositol/Surfactant.total
Short namePI MFr Amn
ComponentPhosphatidylinositol/Surfactant.total
PropertyMFr
TimingPt
System (specimen)Amnio fld
ScaleQn
ClassCHEM
Example units%
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.21
Last changed2.30

Consumer names

Phosphatidylinositol/Surfactant.total, Amniotic fluid

Part names

Phosphatidylinositol/Surfactant.totalMFrPtAmnio fldQnMass fractionPoint in time (spot)Amniotic fluid

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.