diff --git a/src/fields_processing.jl b/src/fields_processing.jl
index e8c2338..37db178 100644
--- a/src/fields_processing.jl
+++ b/src/fields_processing.jl
@@ -23,6 +23,16 @@ end
 
 update_with_coding!(output, coding::Missing, index, coding_to_column_indices) = nothing
 
+maybe_convert_to_int(v, ::Type{<:AbstractFloat}) =
+    convert(Vector{Int}, v) 
+
+maybe_convert_to_int(v, ::Type{<:Union{Missing, AbstractFloat}}) =
+    convert(Vector{Union{Missing, Int}}, v) 
+
+maybe_convert_to_int(v, ::Any) = v
+
+maybe_convert_to_int(v) = maybe_convert_to_int(v, eltype(v))
+
 """
     process_binary_arrayed(dataset, fields_entry)
 """
@@ -55,7 +65,7 @@ function process_binary_arrayed(dataset, fields_entry)
         # This means that a trait is declared present
         # if it is diagnosed at any of the assessment visits
         for colname in field_columns
-            column = dataset[!, colname]
+            column = maybe_convert_to_int(dataset[!, colname])
             for index in eachindex(column)
                 coding = getindex(column, index)
                 update_with_coding!(output, coding, index, coding_to_column_indices)
diff --git a/test/fields_processing.jl b/test/fields_processing.jl
new file mode 100644
index 0000000..5d3c711
--- /dev/null
+++ b/test/fields_processing.jl
@@ -0,0 +1,25 @@
+module TestFieldsProcessing
+
+using DataFrames
+using Test
+using UKBMain
+
+@testset "Test misc functions" begin
+    data = DataFrame(
+        A = [1.0, missing, 2.0],
+        B = [1, missing, 2],
+        C = [1., 2., 3.]
+    )
+    intA = UKBMain.maybe_convert_to_int(data.A)
+    @test eltype(intA) === Union{Missing, Int}
+    intB = UKBMain.maybe_convert_to_int(data.B)
+    @test intB === data.B
+    intC = UKBMain.maybe_convert_to_int(data.C)
+    @test eltype(intC) === Int
+
+
+end
+
+end
+
+true
\ No newline at end of file
diff --git a/test/runtests.jl b/test/runtests.jl
index 9a3dea6..1f3581c 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,4 +1,5 @@
 using Test
 
 @test include("fields_list.jl")
-@test include("datasets_extraction.jl")
\ No newline at end of file
+@test include("datasets_extraction.jl")
+@test include("fields_processing.jl")
\ No newline at end of file