diff --git a/docs/changelog.rst b/docs/changelog.rst
index d23593c..64384e2 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -4,6 +4,7 @@ Changelog
 2.7.0 (unreleased)
 ------------------
 
+- #87 Inject additional analyses fields
 - #85 Allow field projection
 - #81 Support second-level precision on searches against DateIndex
 - #83 Fetch multiple items by UID
diff --git a/src/senaite/jsonapi/configure.zcml b/src/senaite/jsonapi/configure.zcml
index e5646e0..ff561fb 100644
--- a/src/senaite/jsonapi/configure.zcml
+++ b/src/senaite/jsonapi/configure.zcml
@@ -53,6 +53,12 @@
       factory=".dataproviders.DexterityDataProvider"
       />
 
+  <!-- Data provider for Analysis content types (computed fields) -->
+  <adapter
+      name="senaite.jsonapi.dataproviders.AnalysisDataProvider"
+      factory=".dataproviders.AnalysisDataProvider"
+      />
+
 
   <!-- DATA MANAGERS
        Context level interface to get and set values (by name) and get a JSON compatible
diff --git a/src/senaite/jsonapi/dataproviders.py b/src/senaite/jsonapi/dataproviders.py
index c2fa6c5..456b544 100644
--- a/src/senaite/jsonapi/dataproviders.py
+++ b/src/senaite/jsonapi/dataproviders.py
@@ -20,6 +20,7 @@
 
 from AccessControl import Unauthorized
 from Acquisition import aq_base
+from bika.lims.interfaces import IAnalysis
 from plone.dexterity.interfaces import IDexterityContent
 from Products.Archetypes.interfaces import IBaseObject
 from Products.CMFCore.interfaces import ISiteRoot
@@ -225,6 +226,38 @@ def __init__(self, context):
         self.keys = schema.keys()
 
 
+class AnalysisDataProvider(Base):
+    """Data provider for Analysis content types.
+
+    Supplements the standard ATDataProvider with computed fields that are
+    implemented as methods rather than AT schema fields and therefore not
+    picked up automatically.
+    """
+    interface.implements(IInfo)
+    component.adapts(IAnalysis)
+
+    def __init__(self, context):
+        super(AnalysisDataProvider, self).__init__(context)
+        # No schema keys – this provider only adds computed fields via
+        # the attributes mapping below.
+        self.keys = []
+        self.attributes = {}
+
+    def to_dict(self):
+        """Return computed analysis fields."""
+        out = {}
+
+        get_formatted = getattr(self.context, "getFormattedResult", None)
+        if callable(get_formatted):
+            out["getFormattedResult"] = get_formatted(html=False)
+
+        is_retest = getattr(self.context, "isRetest", None)
+        if callable(is_retest):
+            out["isRetest"] = is_retest()
+
+        return out
+
+
 class SiteRootDataProvider(Base):
     """ Site Root Adapter
     """
diff --git a/src/senaite/jsonapi/tests/doctests/analysis_data_provider.rst b/src/senaite/jsonapi/tests/doctests/analysis_data_provider.rst
new file mode 100644
index 0000000..b96ea82
--- /dev/null
+++ b/src/senaite/jsonapi/tests/doctests/analysis_data_provider.rst
@@ -0,0 +1,256 @@
+ANALYSIS DATA PROVIDER
+----------------------
+
+Running this test from the buildout directory:
+
+    bin/test test_doctests -t analysis_data_provider
+
+
+Test Setup
+~~~~~~~~~~
+
+Needed Imports:
+
+    >>> import json
+    >>> import transaction
+    >>> import urllib
+    >>> from DateTime import DateTime
+    >>> from plone.app.testing import setRoles
+    >>> from plone.app.testing import TEST_USER_ID
+    >>> from bika.lims import api
+
+Functional Helpers:
+
+    >>> def get(url):
+    ...     browser.open("{}/{}".format(api_url, url))
+    ...     return browser.contents
+
+    >>> def post(url, data):
+    ...     url = "{}/{}".format(api_url, url)
+    ...     browser.post(url, urllib.urlencode(data, doseq=True))
+    ...     return browser.contents
+
+    >>> def create(data):
+    ...     response = post("create", data)
+    ...     assert("items" in response)
+    ...     response = json.loads(response)
+    ...     items = response.get("items")
+    ...     assert(len(items)==1)
+    ...     item = response.get("items")[0]
+    ...     assert("uid" in item)
+    ...     return api.get_object(item["uid"])
+
+Variables:
+
+    >>> portal = self.portal
+    >>> portal_url = portal.absolute_url()
+    >>> api_url = "{}/@@API/senaite/v1".format(portal_url)
+    >>> setup = api.get_setup()
+    >>> browser = self.getBrowser()
+    >>> setRoles(portal, TEST_USER_ID, ["LabManager", "Manager"])
+    >>> transaction.commit()
+
+
+Create test data
+~~~~~~~~~~~~~~~~
+
+Create the required setup objects:
+
+    >>> client = create({
+    ...     "portal_type": "Client",
+    ...     "parent_path": api.get_path(portal.clients),
+    ...     "title": "Test Client",
+    ...     "ClientID": "TC"})
+
+    >>> contact = create({
+    ...     "portal_type": "Contact",
+    ...     "parent_path": api.get_path(client),
+    ...     "Firstname": "Jane",
+    ...     "Surname": "Doe"})
+
+    >>> sample_type = create({
+    ...     "portal_type": "SampleType",
+    ...     "parent_path": api.get_path(portal.setup.sampletypes),
+    ...     "title": "Water",
+    ...     "MinimumVolume": "100 ml",
+    ...     "Prefix": "WA"})
+
+    >>> lab_contact = create({
+    ...     "portal_type": "LabContact",
+    ...     "parent_path": api.get_path(setup.bika_labcontacts),
+    ...     "Firstname": "Lab",
+    ...     "Surname": "Manager"})
+
+    >>> department = create({
+    ...     "portal_type": "Department",
+    ...     "DepartmentID": "CH",
+    ...     "parent_path": api.get_path(portal.setup.departments),
+    ...     "title": "Chemistry",
+    ...     "Manager": api.get_uid(lab_contact)})
+
+    >>> category = create({
+    ...     "portal_type": "AnalysisCategory",
+    ...     "parent_path": api.get_path(portal.setup.analysiscategories),
+    ...     "title": "Metals",
+    ...     "Department": api.get_uid(department)})
+
+    >>> service = create({
+    ...     "portal_type": "AnalysisService",
+    ...     "parent_path": api.get_path(setup.bika_analysisservices),
+    ...     "title": "Calcium",
+    ...     "Keyword": "Ca",
+    ...     "Price": 10,
+    ...     "Category": api.get_uid(category)})
+
+Create a Sample with one analysis:
+
+    >>> sample = create({
+    ...     "portal_type": "AnalysisRequest",
+    ...     "parent_uid": api.get_uid(client),
+    ...     "Contact": api.get_uid(contact),
+    ...     "DateSampled": DateTime().ISO8601(),
+    ...     "SampleType": api.get_uid(sample_type),
+    ...     "Analyses": [api.get_uid(service)]})
+
+    >>> analyses = sample.getAnalyses(full_objects=True)
+    >>> len(analyses)
+    1
+
+    >>> analysis = analyses[0]
+    >>> analysis_uid = api.get_uid(analysis)
+
+
+Analysis fields via the API
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+When fetching an analysis with ``complete=1``, the response includes the
+computed fields ``getFormattedResult`` and ``isRetest`` injected by the
+``AnalysisDataProvider``:
+
+    >>> response = get("analysis/{}?complete=1".format(analysis_uid))
+    >>> data = json.loads(response)
+    >>> items = data.get("items")
+    >>> len(items)
+    1
+
+    >>> item = items[0]
+
+The ``getFormattedResult`` field is present.  Since no result has been
+submitted yet, it returns an empty string:
+
+    >>> "getFormattedResult" in item
+    True
+    >>> item["getFormattedResult"]
+    u''
+
+The ``isRetest`` field is present and ``False`` for a regular analysis:
+
+    >>> "isRetest" in item
+    True
+    >>> item["isRetest"]
+    False
+
+
+Formatted result after submitting a value
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Receive the sample and submit a result for the analysis:
+
+    >>> from bika.lims.workflow import doActionFor as do_action_for
+    >>> transitioned = do_action_for(sample, "receive")
+    >>> analysis.setResult("42")
+    >>> transaction.commit()
+
+The formatted result now reflects the submitted value:
+
+    >>> response = get("analysis/{}?complete=1".format(analysis_uid))
+    >>> data = json.loads(response)
+    >>> item = data["items"][0]
+    >>> item["getFormattedResult"]
+    u'42'
+    >>> item["isRetest"]
+    False
+
+
+Formatted result with ResultOptions
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Create a service with predefined result options (select type):
+
+    >>> service_ro = create({
+    ...     "portal_type": "AnalysisService",
+    ...     "parent_path": api.get_path(setup.bika_analysisservices),
+    ...     "title": "Color",
+    ...     "Keyword": "Color",
+    ...     "Price": 5,
+    ...     "Category": api.get_uid(category)})
+
+    >>> options = [
+    ...     {"ResultValue": "0", "ResultText": "Colorless"},
+    ...     {"ResultValue": "1", "ResultText": "Yellow"},
+    ...     {"ResultValue": "2", "ResultText": "Brown"},
+    ... ]
+    >>> service_ro.setResultOptions(options)
+    >>> service_ro.setResultType("select")
+    >>> transaction.commit()
+
+Create a sample with this service:
+
+    >>> sample2 = create({
+    ...     "portal_type": "AnalysisRequest",
+    ...     "parent_uid": api.get_uid(client),
+    ...     "Contact": api.get_uid(contact),
+    ...     "DateSampled": DateTime().ISO8601(),
+    ...     "SampleType": api.get_uid(sample_type),
+    ...     "Analyses": [api.get_uid(service_ro)]})
+
+    >>> analyses2 = sample2.getAnalyses(full_objects=True)
+    >>> an_color = analyses2[0]
+    >>> an_color_uid = api.get_uid(an_color)
+
+Receive the sample and set a result using one of the option values:
+
+    >>> transitioned = do_action_for(sample2, "receive")
+    >>> an_color.setResult("1")
+    >>> transaction.commit()
+
+The formatted result returns the display text, not the raw value:
+
+    >>> response = get("analysis/{}?complete=1".format(an_color_uid))
+    >>> data = json.loads(response)
+    >>> item = data["items"][0]
+    >>> item["getFormattedResult"]
+    u'Yellow'
+    >>> item["isRetest"]
+    False
+
+
+Retest analysis
+~~~~~~~~~~~~~~~
+
+Submit the first analysis and then retract it to create a retest:
+
+    >>> transitioned = do_action_for(analysis, "submit")
+    >>> transitioned = do_action_for(analysis, "retract")
+    >>> transaction.commit()
+
+The retracted analysis now has a retest.  Fetch the retest:
+
+    >>> retest = analysis.getRetest()
+    >>> retest_uid = api.get_uid(retest)
+
+The retest is flagged as such via the API:
+
+    >>> response = get("analysis/{}?complete=1".format(retest_uid))
+    >>> data = json.loads(response)
+    >>> item = data["items"][0]
+    >>> item["isRetest"]
+    True
+
+The original retracted analysis is not a retest:
+
+    >>> response = get("analysis/{}?complete=1".format(analysis_uid))
+    >>> data = json.loads(response)
+    >>> item = data["items"][0]
+    >>> item["isRetest"]
+    False