LOINC Code 40998-7: Calcium hydrogen phosphate dihydrate (Stone) [Mass 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 Calcium hydrogen phosphate dihydrate/Total. It is commonly used with the system or sample type Calculus.

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: Observation

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• Calcium hydrogen phosphate dihydrate/Total in Stone
• Calcium hydrogen phosphate dihydrate/Total
• Brushite; Ca; Ca H2 Phos dihyd; Cal; Calc; Calculi; Chemistry; CHPD; Gastro; Gastroenterology; GI; H2; Hyd; i Phos; Inorganic phosphate; Kidney; Mass Fraction; Nephrology; Percent; Phos; Phosphate total; Phosphorous; Phosphorus; Phosphrous; Pi; PO4; Point in time; QNT; Quan; Quant; Quantitative; Random; Renal; Stn; Stone; Stones; 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

Frequently asked questions