LOINC Code 75025-7: Coproporphyrin 3/Total porphyrins (Stl) [Molar fraction]

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 Coproporphyrin 3/Porphyrins.total. 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

• Coproporphyrin 3/Porphyrins.total in Stool
• Coproporphyrin 3/Porphyrins.total
• Total fecal porphyrins are markedly increased especially in active HCP (Hereditary Coproporphyria) and VP (Variegate Porphyria) and to a lesser extent in PCT (Porphyria Cutanea Tarda) and EPP (Erythropoietic Protoporphyria). Fecal porphyrins can be separated and measured individually by HPLC. Porphyrins with 2-4 carboxyl groups generally predominate in feces. These are excreted by the liver into the bile and then flow into the intestine. As with urine, it is most useful to measure the total amount of porphyrins in a fecal sample. If this is increased, then the laboratory should determine which porphyrins predominate rather than focus on the amount of each porphyrin. Fecal porphyrin determinations may be confounded by variations in fecal flow; most people have one or a few bowel movements daily and a "24 hour stool collection" is really not uniform from day to day. Substances in the diet and any internal bleeding into the stomach or intestines may also interfere.
• Bowel movement; Chemistry; Copro; Copro3; Coproporph; Coproporphyrin III; Coproporphyrins; Faecal; Faeces; Fecal; Feces; Hematology; Heme; III; Percent; Point in time; Porph; Porphyrin; QNT; Quan; Quant; Quantitative; Random; Stl; Stool = Fecal; Substance Fraction; Tetracarboxyl porphyrin; Tetracarboxylporphyrin; Tetracarboxylporphyrins; Tetracarboxyporphyrin; 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.

Related SNOMED CT concepts

Related observations and tests

Common synonyms

Frequently asked questions