diff --git a/tests/utils.test.js b/tests/utils.test.js
index f0d5d60..7c38c7f 100644
--- a/tests/utils.test.js
+++ b/tests/utils.test.js
@@ -74,3 +74,18 @@ suite('Days and hours display', () => {
 		}
 	});
 });
+
+suite('Bilirubin display', () => {
+	test('< 10 micromol/L', () => {
+		assert.equal(prettyPrintBilirubin(0), '0.0');
+		assert.equal(prettyPrintBilirubin(0.420), '0.4');
+		assert.equal(prettyPrintBilirubin(3.1415), '3.1');
+		assert.equal(prettyPrintBilirubin(3.99), '4.0');
+	});
+	
+	test('>= 10 micromol/L', () => {
+		assert.equal(prettyPrintBilirubin(42), '42');
+		assert.equal(prettyPrintBilirubin(90.210), '90');
+		assert.equal(prettyPrintBilirubin(90.99), '91');
+	});
+});