Example definition of venous blood specimen.

{
  "resourceType" : "SpecimenDefinition",
  "id" : "7",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "oo"
  }],
  "url" : "http://example-lab.com/specdef/123455",
  "identifier" : {
    "value" : "123455"
  },
  "title" : "Venous blood specimen",
  "status" : "active",
  "experimental" : true,
  "publisher" : "HL7 International / Orders and Observations",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/orders"
    }]
  }],
  "typeCollected" : {
    "coding" : [{
      "system" : "http://snomed.info/sct",
      "code" : "122555007"
    }],
    "text" : "Venous blood specimen (specimen)"
  },
  "patientPreparation" : [{
    "text" : "no strict fasting"
  }],
  "typeTested" : [{
    "isDerived" : true,
    "type" : {
      "coding" : [{
        "system" : "http://snomed.info/sct",
        "code" : "119364003"
      }],
      "text" : "Serum specimen (specimen)"
    },
    "preference" : "preferred",
    "container" : {
      "material" : {
        "text" : "glass"
      },
      "type" : {
        "coding" : [{
          "system" : "http://snomed.info/sct",
          "code" : "702281005",
          "display" : "Evacuated blood collection tube with thrombin and clot activator and gel separator"
        }]
      },
      "cap" : {
        "coding" : [{
          "system" : "http://terminology.hl7.org/5.1.0/CodeSystem-container-cap.html",
          "code" : "yellow",
          "display" : "yellow cap"
        }]
      },
      "minimumVolumeQuantity" : {
        "value" : 2,
        "unit" : "ml",
        "system" : "http://unitsofmeasure.org",
        "code" : "mL"
      }
    },
    "handling" : [{
      "temperatureQualifier" : {
        "coding" : [{
          "code" : "room",
          "display" : "room temperature"
        }]
      },
      "temperatureRange" : {
        "low" : {
          "value" : 15,
          "unit" : "°C",
          "system" : "http://unitsofmeasure.org",
          "code" : "Cel"
        },
        "high" : {
          "value" : 25,
          "unit" : "°C",
          "system" : "http://unitsofmeasure.org",
          "code" : "Cel"
        }
      },
      "maxDuration" : {
        "value" : 12,
        "system" : "http://unitsofmeasure.org",
        "code" : "h"
      }
    }]
  }]
}