LOINCActiveBoth

LOINC Code 49918-6: Heptacarboxylporphyrin II Unsp time (Stl) [Mass/Time]

49918-6 is a LOINC code used to identify Heptacarboxylporphyrin II Unsp time (Stl) [Mass/Time] 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 Heptacarboxylporphyrin II. It is commonly used with the system or sample type Stool.

Reviewed by HealthAssure Clinical TeamUpdated 21 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 Heptacarboxylporphyrin II. It is commonly used with the system or sample type Stool.

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

  • Heptacarboxylporphyrin II [Mass/time] in unspecified time Stool
  • Heptacarboxylporphyrin II
  • ?Tm; 2; Bowel movement; Chemistry; Faecal; Faeces; Fecal; Feces; Hematology; Heme; Hepacarboxyporph; Heptacarbox; Heptacarboxyl porphyrin; Heptacarboxylate porphyrin; Heptacarboxylporphyrins; Heptacarboxyporph; Heptacarboxyporphyrin; Hepta-CP; Hepta-CP II; Heptaporphyrin; Hexacarboxyl porphyrin; Mass rate; mRate; QNT; Quan; Quant; Quantitative; Stl; Stool = Fecal

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

Heptacarboxylporphyrin II Unsp time (Stl) [Mass/Time]Heptacarboxylporphyrin II [Mass/time] in unspecified time StoolHepta-CP II ?Tm Stl-mRateHeptacarboxylporphyrin IICHEMHeptacarboxylporphyrin II, StoolMRat

Frequently asked questions

Code details

Code49918-6
SystemLOINC
Display nameHeptacarboxylporphyrin II Unsp time (Stl) [Mass/Time]
DescriptionHeptacarboxylporphyrin II
Short nameHepta-CP II ?Tm Stl-mRate
ComponentHeptacarboxylporphyrin II
PropertyMRat
TimingXXX
System (specimen)Stool
ScaleQn
ClassCHEM
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.22
Last changed2.70

Consumer names

Heptacarboxylporphyrin II, Stool

Part names

Heptacarboxylporphyrin IIMRatXXXStoolQnMass RateUnspecified

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.

LOINC Code 49918-6 | HealthAssure