This result may be variable though from lab to lab, and may not give accurate results, so we usually do not rely on this as a sole indicator.
Esi siphumo sinokwahluka ngokwelebhu olwenziwe kuyo uvavanyo, yaye kungenzeka zingachaneki ezi ziphumo ngoko ke asixhomekeki kuzo njengesalathisi ekuphela kwaso.