diff --git a/modules/lassoBidAdapter.js b/modules/lassoBidAdapter.js
index 6215af03a97..dc36cb4af23 100644
--- a/modules/lassoBidAdapter.js
+++ b/modules/lassoBidAdapter.js
@@ -44,6 +44,8 @@ export const spec = {
         sizes,
         aimXR,
         uid: '$UID',
+        npi: bidRequest.params.npi || '',
+        npi_hash: bidRequest.params.npiHash || '',
         params: JSON.stringify(bidRequest.params),
         crumbs: JSON.stringify(bidRequest.crumbs),
         prebidVersion: '$prebid.version$',
@@ -128,10 +130,10 @@ function getBidRequestUrl(aimXR, params) {
   if (params && params.dtc) {
     path = '/dtc-request';
   }
-  if (!aimXR) {
-    return GET_IUD_URL + ENDPOINT_URL + path;
+  if (aimXR || params.npi || params.npiHash) {
+    return ENDPOINT_URL + path;
   }
-  return ENDPOINT_URL + path;
+  return GET_IUD_URL + ENDPOINT_URL + path;
 }
 
 function getDeviceData() {
diff --git a/test/spec/modules/lassoBidAdapter_spec.js b/test/spec/modules/lassoBidAdapter_spec.js
index 15dee20e566..f33869e9366 100644
--- a/test/spec/modules/lassoBidAdapter_spec.js
+++ b/test/spec/modules/lassoBidAdapter_spec.js
@@ -3,6 +3,7 @@ import { spec } from 'modules/lassoBidAdapter.js';
 import { server } from '../../mocks/xhr';
 
 const ENDPOINT_URL = 'https://trc.lhmos.com/prebid';
+const GET_IUD_URL = 'https://secure.adnxs.com/getuid?';
 
 const bid = {
   bidder: 'lasso',
@@ -78,7 +79,7 @@ describe('lassoBidAdapter', function () {
     });
   });
 
-  describe('buildRequests', function () {
+  describe('buildRequests with standard flow', function () {
     let validBidRequests, bidRequest;
     before(() => {
       validBidRequests = spec.buildRequests([bid], bidderRequest);
@@ -97,6 +98,75 @@ describe('lassoBidAdapter', function () {
       expect(bidRequest.method).to.exist;
       expect(bidRequest.method).to.equal('GET');
     });
+
+    it('should send request to get uid and trc via get request', () => {
+      expect(bidRequest.method).to.equal('GET');
+      expect(bidRequest.url).to.equal(GET_IUD_URL + ENDPOINT_URL + '/request');
+    });
+  });
+
+  describe('buildRequests with npi', function () {
+    let validBidRequests, bidRequest;
+    before(() => {
+      const updateBidParams = Object.assign({}, bid, {
+        params: {
+          adUnitId: 123456,
+          npi: '123'
+        }
+      });
+      validBidRequests = spec.buildRequests([updateBidParams], bidderRequest);
+      expect(validBidRequests).to.be.an('array').that.is.not.empty;
+      bidRequest = validBidRequests[0];
+    })
+
+    it('Returns valid bidRequest', function () {
+      expect(bidRequest).to.exist;
+      expect(bidRequest.method).to.exist;
+      expect(bidRequest.url).to.exist;
+      expect(bidRequest.data).to.exist;
+    });
+
+    it('Returns GET method', function() {
+      expect(bidRequest.method).to.exist;
+      expect(bidRequest.method).to.equal('GET');
+    });
+
+    it('should send request to trc via get request with npi', () => {
+      expect(bidRequest.method).to.equal('GET');
+      expect(bidRequest.url).to.equal(ENDPOINT_URL + '/request');
+    });
+  });
+
+  describe('buildRequests with npi hash', function () {
+    let validBidRequests, bidRequest;
+    before(() => {
+      const updateBidParams = Object.assign({}, bid, {
+        params: {
+          adUnitId: 123456,
+          npiHash: '123'
+        }
+      });
+      validBidRequests = spec.buildRequests([updateBidParams], bidderRequest);
+      expect(validBidRequests).to.be.an('array').that.is.not.empty;
+      bidRequest = validBidRequests[0];
+    })
+
+    it('Returns valid bidRequest', function () {
+      expect(bidRequest).to.exist;
+      expect(bidRequest.method).to.exist;
+      expect(bidRequest.url).to.exist;
+      expect(bidRequest.data).to.exist;
+    });
+
+    it('Returns GET method', function() {
+      expect(bidRequest.method).to.exist;
+      expect(bidRequest.method).to.equal('GET');
+    });
+
+    it('should send request to trc via get request with npi', () => {
+      expect(bidRequest.method).to.equal('GET');
+      expect(bidRequest.url).to.equal(ENDPOINT_URL + '/request');
+    });
   });
 
   describe('interpretResponse', function () {