diff --git a/Example/Podfile.lock b/Example/Podfile.lock
index 6344dd8..6d509c0 100644
--- a/Example/Podfile.lock
+++ b/Example/Podfile.lock
@@ -1,6 +1,6 @@
 PODS:
   - Expecta (1.0.5)
-  - Granola (0.3.0):
+  - Granola (0.4.0):
     - ObjectiveSugar (~> 1.1)
   - ObjectiveSugar (1.1.0)
   - Specta (1.0.5)
@@ -18,7 +18,7 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   Expecta: e1c022fcd33910b6be89c291d2775b3fe27a89fe
-  Granola: 9363048b8cc0309b43ed1f6b700af47b55b74f35
+  Granola: c765790ab0a5ab322cb09717f415a1d12e0bdcb4
   ObjectiveSugar: a6a25f23d657c19df0a0b972466d5b5ca9f5295c
   Specta: ac94d110b865115fe60ff2c6d7281053c6f8e8a2
   VVJSONSchemaValidation: 11f5ba886e80baccae5d606f3b10f20c1303200d
diff --git a/Example/Tests/OMHSampleFactory.m b/Example/Tests/OMHSampleFactory.m
index 9f603e5..b615821 100644
--- a/Example/Tests/OMHSampleFactory.m
+++ b/Example/Tests/OMHSampleFactory.m
@@ -168,7 +168,8 @@ + (HKSample*)typeIdentifier:(NSString*)sampleTypeIdentifier
                  HKQuantityTypeIdentifierBodyFatPercentage,
                  HKQuantityTypeIdentifierRespiratoryRate,
                  HKQuantityTypeIdentifierBodyTemperature,
-                 HKQuantityTypeIdentifierBasalBodyTemperature
+                 HKQuantityTypeIdentifierBasalBodyTemperature,
+                 HKQuantityTypeIdentifierBloodAlcoholContent
                  ] includes:sampleTypeIdentifier]) {
         
         NSString* defaultUnitString = nil;
@@ -188,7 +189,8 @@ + (HKSample*)typeIdentifier:(NSString*)sampleTypeIdentifier
             defaultUnitString = @"mcg";
         } else if (sampleTypeIdentifier == HKQuantityTypeIdentifierDietaryWater) {
             defaultUnitString = @"L";
-        } else if (sampleTypeIdentifier == HKQuantityTypeIdentifierOxygenSaturation || sampleTypeIdentifier == HKQuantityTypeIdentifierBodyFatPercentage) {
+        } else if (sampleTypeIdentifier == HKQuantityTypeIdentifierOxygenSaturation || sampleTypeIdentifier == HKQuantityTypeIdentifierBodyFatPercentage
+                   || sampleTypeIdentifier == HKQuantityTypeIdentifierBloodAlcoholContent) {
             defaultUnitString = @"%";
         } else if (sampleTypeIdentifier == HKQuantityTypeIdentifierBodyTemperature || sampleTypeIdentifier == HKQuantityTypeIdentifierBasalBodyTemperature) {
             defaultUnitString = @"degC";
diff --git a/Example/Tests/OMHSerializerTests.m b/Example/Tests/OMHSerializerTests.m
index 4b433cc..e7b8ad0 100644
--- a/Example/Tests/OMHSerializerTests.m
+++ b/Example/Tests/OMHSerializerTests.m
@@ -652,6 +652,32 @@
     });
 });
 
+describe(@"Generic quantity sample with percent unit", ^{
+    itShouldBehaveLike(@"AnySerializerForSupportedSample",^{
+        NSDate *start = [NSDate date];
+        NSDate *end = start;
+        NSNumber *value = [NSNumber numberWithDouble:.127];
+        NSString *unitString = @"%";
+        HKSample *sample = [OMHSampleFactory typeIdentifier:HKQuantityTypeIdentifierBloodAlcoholContent
+                                                      attrs:@{@"value":value,
+                                                              @"unitString":unitString,
+                                                              @"start":start,
+                                                              @"end":end}];
+        return @{
+                 @"sample":sample,
+                 @"pathsToValues": @{
+                         @"header.schema_id.name": @"hk-quantity-sample",
+                         @"header.schema_id.namespace":@"granola",
+                         @"header.schema_id.version": @"1.0",
+                         @"body.quantity_type":[HKQuantityTypeIdentifierBloodAlcoholContent description],
+                         @"body.unit_value.value":@12.7,
+                         @"body.unit_value.unit":@"%",
+                         @"body.effective_time_frame.date_time":[start RFC3339String]
+                         }
+                 };
+    });
+});
+
 describe(HKCorrelationTypeIdentifierFood,^{
     itShouldBehaveLike(@"AnySerializerForSupportedSample", ^{
         NSDate *sampleDate = [NSDate date];
@@ -1058,7 +1084,7 @@
 describe(@"HKQuantityTypeIdentifierOxygenSaturation with time_interval", ^{
     itShouldBehaveLike(@"AnySerializerForSupportedSample",^{
         NSDate *start = [NSDate date];
-        NSNumber *value = [NSNumber numberWithFloat:96.1];
+        NSNumber *value = [NSNumber numberWithDouble:.961];
         NSString *unitString = @"%";
         HKSample *sample = [OMHSampleFactory typeIdentifier:HKQuantityTypeIdentifierOxygenSaturation
                                                       attrs:@{@"value":value,
@@ -1071,7 +1097,7 @@
                          @"header.schema_id.name": @"oxygen-saturation",
                          @"header.schema_id.namespace":@"omh",
                          @"header.schema_id.version": @"1.0",
-                         @"body.oxygen_saturation.value":value,
+                         @"body.oxygen_saturation.value":@96.1,
                          @"body.oxygen_saturation.unit":unitString,
                          @"body.effective_time_frame.date_time":[start RFC3339String]
                          }
@@ -1109,7 +1135,7 @@
     itShouldBehaveLike(@"AnySerializerForSupportedSample",^{
         NSDate *start = [NSDate date];
         NSDate *end = [start dateByAddingTimeInterval:3600];
-        NSNumber *value = [NSNumber numberWithFloat:23.2];
+        NSNumber *value = [NSNumber  numberWithDouble:.232];
         NSString *unitString = @"%";
         HKSample *sample = [OMHSampleFactory typeIdentifier:HKQuantityTypeIdentifierBodyFatPercentage
                                                       attrs:@{@"value":value,
@@ -1122,7 +1148,7 @@
                          @"header.schema_id.name": @"body-fat-percentage",
                          @"header.schema_id.namespace":@"omh",
                          @"header.schema_id.version": @"1.0",
-                         @"body.body_fat_percentage.value": value,
+                         @"body.body_fat_percentage.value": @23.2,
                          @"body.body_fat_percentage.unit": unitString,
                          @"body.effective_time_frame.time_interval.start_date_time": [sample.startDate RFC3339String],
                          @"body.effective_time_frame.time_interval.end_date_time": [sample.endDate RFC3339String]
diff --git a/Granola.podspec b/Granola.podspec
index 5ac7bb8..7dd1d28 100644
--- a/Granola.podspec
+++ b/Granola.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = "Granola"
-  s.version          = "0.4.0" 
+  s.version          = "0.4.1" 
   s.summary          = "A healthful serializer for your HealthKit data."
   s.homepage         = "https://github.com/openmhealth/Granola"
   s.license          = { :type => 'Apache 2.0',
diff --git a/Pod/Classes/OMHSerializer.m b/Pod/Classes/OMHSerializer.m
index 062d029..b1f2ea3 100644
--- a/Pod/Classes/OMHSerializer.m
+++ b/Pod/Classes/OMHSerializer.m
@@ -430,11 +430,11 @@ + (BOOL)canSerialize:(HKQuantitySample*)sample error:(NSError**)error {
 - (id)bodyData {
     NSString* unitString = @"%";
     HKUnit* unit = [HKUnit unitFromString:unitString];
-    float value = [[(HKQuantitySample*)self.sample quantity] doubleValueForUnit:unit];
+    double value = [[(HKQuantitySample*)self.sample quantity] doubleValueForUnit:unit];
     
     return @{
              @"oxygen_saturation": @{
-                     @"value": [NSNumber numberWithDouble:value],
+                     @"value": [NSNumber numberWithDouble:value*100],
                      @"unit": unitString
                      },
              @"effective_time_frame": [self populateTimeFrameProperty:self.sample.startDate endDate:self.sample.endDate]
@@ -618,11 +618,10 @@ + (BOOL)canSerialize:(HKQuantitySample*)sample error:(NSError**)error {
 - (id)bodyData {
     NSString* unitString = @"%";
     HKUnit* unit = [HKUnit unitFromString:unitString];
-    float value =
-    [[(HKQuantitySample*)self.sample quantity] doubleValueForUnit:unit];
+    double value = [[(HKQuantitySample*)self.sample quantity] doubleValueForUnit:unit];
     return @{
              @"body_fat_percentage": @{
-                     @"value": [NSNumber numberWithDouble:value],
+                     @"value": [NSNumber numberWithDouble:value*100],
                      @"unit": unitString
                      },
              @"effective_time_frame": [self populateTimeFrameProperty:self.sample.startDate endDate:self.sample.endDate]
@@ -784,7 +783,21 @@ - (id)bodyData {
     HKQuantitySample *quantitySample = (HKQuantitySample*)self.sample;
     HKQuantity *quantity = [quantitySample quantity];
     NSMutableDictionary *serializedUnitValues = [NSMutableDictionary new];
-    if ([quantity isCompatibleWithUnit:[HKUnit unitFromString:@"count"]]) {
+    
+    if ([[OMHSerializer parseUnitFromQuantity:quantity] isEqualToString:@"%"]) {
+        
+        // Types that use "%" units are compatible with the "count" unit (in the next condition), so this condition to pre-empts that.
+        NSNumber* value = [NSNumber numberWithDouble:[quantity doubleValueForUnit:[HKUnit percentUnit]]];
+        
+        [serializedUnitValues addEntriesFromDictionary:@{
+                                                         @"unit_value":@{
+                                                                 @"value": @([value floatValue] * 100),
+                                                                 @"unit": @"%"
+                                                                 }
+                                                         }
+         ];
+    }
+    else if ([quantity isCompatibleWithUnit:[HKUnit unitFromString:@"count"]]) {
         [serializedUnitValues addEntriesFromDictionary:@{
                                                          @"count": [NSNumber numberWithDouble:[quantity doubleValueForUnit:[HKUnit unitFromString:@"count"]]]
                                                          }