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Jaundice is one of the most common problem that can occur in the newborn. The study group included 30 neonates (15 term and 15 preterm) and control group included 20 neonates (10 terms & 10 preterm). All had hyperbilirubinemia. The controls were fully matched with the study group. All the neonates included in the study group required management with phototherapy. The neonates in the control group were managed without phototherapy. Measurement of ionized serum calcium level was done before and after 48 hours of institution of phototherapy in study groups and controls. Before phototherapy, there was no statistical significant difference in mean serum calcium level in term & preterm neonates of both study & control group. After 48 hours of phototherapy in study group, a significant fall in calcium level in 66.6% of term & 80% of preterm neonates was observed. Whereas, no difference was observed in control group. It is suggested that calcium level be assessed in neonates treated with phototherapy for more then 48 hours and managed accordingly.