diff --git a/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt b/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt
index 1868e98..6729914 100644
--- a/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt
+++ b/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt
@@ -679,7 +679,7 @@ class HemoCubeFragment : Fragment() {
             val led2Average = log10(led2BufferForDevice.div(led2SampleForDevice))
             val led3Average = log10(led3BufferForDevice.div(led3SampleForDevice))
             val led4Average = log10(led4BufferForDevice.div(led4SampleForDevice))
-            val deviceRatio = led4Average / led1Average
+            val deviceRatio = led2Average / led1Average
 
             if (led1BufferForDevice < Constants.BUFFER_INTENSITY_THRESHOLDS[deviceHardwareId]?.get(0)
                     ?.get(0)!!
@@ -777,10 +777,11 @@ class HemoCubeFragment : Fragment() {
                 }
             }
 
-            if ((led1Average < 0.7 || led2Average < 0.7 || led3Average < 0.7 || led4Average < 0.7) && calculatedSlopeRatio > 35.0) {
+            var absorbanceLowerLimit = 0.0
+            if (led1Average < absorbanceLowerLimit || led2Average < absorbanceLowerLimit || led3Average < absorbanceLowerLimit || led4Average < absorbanceLowerLimit) {
                 validationError = true
                 activity?.runOnUiThread {
-                    binding.errorMessage.text = "Severely Low Hb. Repeat test with 12 ul in 2 ml Buffer"
+                    binding.errorMessage.text = "Invalid"
                     binding.errorMessage.visibility = View.VISIBLE
                 }
             }