This code system http://hl7.org/fhir/substance-weight-method defines the following codes:

Code Display
SDS-PAGE SDS-PAGE (sodium dodecyl sulfate-polyacrylamide gel electrophoresis)
Calculated calculated
LighScattering light scattering
Viscosity viscosity
GelPermeationCentrifugation gel permeation centrifugation
End-groupAnalysis End-group analysis
End-groupTitration End-group titration
Size-ExclusionChromatography Size-exclusion chromatography
<status value="active"/> <experimental value="false"/> <date value="2021-01-05T10:01:24+11:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="SubstanceWeightMethod"/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/substance-weight-method"/> <content value="complete"/> <concept> <code value="SDS-PAGE"/> <display value="SDS-PAGE (sodium dodecyl sulfate-polyacrylamide gel electrophoresis)"/> </concept> <concept> <code value="Calculated"/> <display value="calculated"/> </concept> <concept> <code value="LighScattering"/> <display value="light scattering"/> </concept> <concept> <code value="Viscosity"/> <display value="viscosity"/> </concept> <concept> <code value="GelPermeationCentrifugation"/> <display value="gel permeation centrifugation"/> </concept> <concept> <code value="End-groupAnalysis"/> <display value="End-group analysis"/> </concept> <concept> <code value="End-groupTitration"/> <display value="End-group titration"/> </concept> <concept> <code value="Size-ExclusionChromatography"/> <display value="Size-exclusion chromatography"/> </concept> </CodeSystem>