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3017766
Your complement system consists of a group of important proteins in your bloodstream. These proteins help your immune system fight off harmful invaders, such as bacteria, and other foreign substances. The complement component 4 (C4) test is a simple blood test that measures the amount of complement C4 circulating in your bloodstream. A low level of C4 is associated with autoimmune diseases, such as lupus and rheumatoid arthritis. [1]
The University of Iowa Department of Pathology notes a reference range of 16 mg/dL - 47 mg/dL. [2]
In the OMOP vocabulary 3017766 is a Standard Concept that represents the measurement COMPLEMENT C4 [MASS/VOLUME] IN SERUM OR PLASMA
The recommended low and high values for each unit associated with 3017766 are below. These are not meant to be normal values. Rather, these are meant to be biologically plausible values. For example, it would be implausible to see a patient with a weight of 0 kg though a person could be 2.5 kg.
In the OMOP vocabulary 8840 is a Standard Concept that represents the unit MILLIGRAM PER DECILITER
0.001
100
The range 0.001-100 was chosen based on values seen in real world data. There are a number of outliers seen in this measurement likely due to source data entry mis-types and/or meaurement mis-labeling. In the data reviewed more than 98% of data with this standard unit concept should be accounted for.