LOINC Code 74590-1: NADH cytochrome C reductase/Citrate synthase (Tiss) [Catalytic ratio]

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 NADH cytochrome C reductase/Citrate synthase. It is commonly used with the system or sample type Tiss.

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

• NADH cytochrome C reductase/Citrate synthase [Enzymatic activity ratio] in Tissue
• NADH cytochrome C reductase/Citrate synthase
• Assesses the ratio between the activity of Complex I + III and citrate synthase. This ratio gives an idea of the amount of activity of complex I + III relative to the amount of mitochondria. The submitter' slab measure Complex I+III activity as rotenone-sensitive NADH cytochrome c reductase activity.
• Catalytic Concentration Ratio; Catalytic Ratio; CCrto; Chemistry; Cit Syn; Citric acid; cyt; Enzymatic activity ratio; NADH CyC Reduct; Point in time; QNT; Quan; Quant; Quantitative; Random; Tissue; Tissue, unspecified

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

Frequently asked questions