LOINC Code 49930-1: LDH in pleural fluid/Lactate dehydrogenase in serum (S/P+Pleur fld) [Relative 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 Lactate dehydrogenase.plr fld/Lactate dehydrogenase.serum. It is commonly used with the system or sample type Ser/Plas+Plr fld.

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

• Lactate dehydrogenase in pleural fluid/Lactate dehydrogenase in serum
• Lactate dehydrogenase.plr fld/Lactate dehydrogenase.serum
• 2-Hydroxypropanoic acid; 2-hydroxy-propionate; 2-hydroxy-propionic acid; Chemistry; Dehydrog; Dehyrdogenase; L.D.H; Lact; Lactic acid; Lactic acid dehydrogenase; LD; LDH; LDH Plr; LDH.serum; L-lactate; L-lactate dehydrogenase; Pl; Plasma; Pleural; Pleural fluid; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; Relative ratio; Ser; SerP; SerPl; SerPl+Plr; SerPlas; Serum; Serum or plasma; SR; thoracentesis fluid; Tumor marker

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