LOINC Code 62678-8: Deprecated PhenX measure - contact biometry

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 PhenX measure - contact biometry. It is commonly used with the system or sample type ^Patient.

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: DEPRECATED
• Method: PhenX

What it does not mean

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

Key facts

• Deprecated PhenX measure - contact biometry
• PhenX measure - contact biometry
• Axial length of the eye and central corneal thickness is measured using contact biometry and pachymetry. Depth of the anterior chamber, lens thickness and depth of the posterior chamber can also be obtained. Many eye diseases are known to be associated with either excessively short eyes (nanophthalmos and angle closure glaucoma) or excessively long eyes (degenerative myopia, Stickler's Syndrome). In addition, ocular biometry provides information about the thickness of the lens (for studies of cataract) and the size of the posterior chamber. Axial length of the eye is an essential measurement for selecting the proper intraocular lens when doing cataract surgery. Central corneal thickness influences intraocular pressure measurements (thicker corneas result in artificially higher pressure and thinner corneas in lower pressure). In addition thinner central corneal thickness may be an independent risk factor for optic nerve degeneration in glaucoma.Results of all measurements are then printed. The WG recommends that three readings be taken and recorded from each eye for both axial length and central corneal thickness (measurements in millimeters). The WG recommends that the central corneal thickness-pachymetry measurements be taken first followed by the axial length measurements, as presented in this protocol. This protocol for contact biometry uses the ultrasonic A scan/pachymeter DGH 4000B SBH IOL Computation module. Other instruments can be used to measure ocular biometry including axial length and central corneal thickness. If other instruments are used, the reproducibility of the measurements should be comparable to those acquired with this protocol. In addition, when other instruments are used to collect these measurements, the manufacturer and model of equipment should be recorded. These other devices may require some different steps than are described in this protocol. Investigators should follow the equipment manufacturer's instructions to ensure quality control.
• Pan; Panel; PANEL.PHENX; Panl; Pnl; Point in time; Random

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