LOINC Code 94129-4: Water deprivation challenge panel (U+S/P)

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 Water deprivation challenge panel. It is commonly used with the system or sample type Urine+Ser/Plas.

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: Order
• Panel type: Panel

What it does not mean

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

Key facts

• Water deprivation challenge panel - Urine and Serum or Plasma
• Water deprivation challenge panel
• A water deprivation test is used to help diagnose diabetes insipidus (DI) and differentiate between different forms of DI and other disorders such as primary polydipsia. In the first phase of the test, the body's response to fluid fasting is measured with a series of timed urine osmolality +/- serum/plasma analyte measurements. The exact analytes that are measured and the timing depends on the protocol used. At the end of the first phase, if the patient has not developed significant dehydration or hyperosmolarity (in which case the testing would be stopped), the second phase of testing is begun. The second phase involves assessing the body's response to a dose of vasopressin and helps differentiate between central and nephrogenic DI.
• CHEMISTRY.CHALLENGE TESTING; Pan; PANEL.CHALLENGE; Panl; Pl; Plasma; Plsm; Pnl; Point in time; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; UA; UR; Ur+SerPl; Urn; Water deprivation Pnl

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