LOINC Code 74302-1: Tyrosine post therapeutic diet (DBS) [Moles/Vol]

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 Tyrosine^post therapeutic diet. It is commonly used with the system or sample type Bld.dot.

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

• Tyrosine [Moles/volume] in DBS --post therapeutic diet
• Tyrosine^post therapeutic diet
• This test measures the tyrosine (TYR) level in children who have been diagnosed with phenylketonuria or tyrosinemia and are on a therapeutic diet for their condition. The parent of the patient collects the dried blood spot specimen at home and sends it to the laboratory. The tyrosine level is used in combination with phenylalanine and succinylacetone levels to monitor the patient's progress.
• After; Blood; CHEMISTRY.CHALLENGE TESTING; DBS; Dried blood spot; Filter paper; FP; Level; p diet; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; Substance concentration; Ther; Tyr; WB; Whole blood

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