Transcutaneous bilirubin (TcB) consists of the skin-deposited bilirubin. Free bilirubin speaks to the protein-unbound bilirubin (UB) that can go into the tissues. We expected to portray the connection between UB-TcB and study the section of UB into the skin. We tentatively enlisted 40 neonates and we estimated TcB, UB and all out serum bilirubin. Different locales TcB estimation was performed. TcB has a comparative relationship with UB and TSB.There is asignifigant relationship with TSB, DSB(direct serum bilirubin) between embittered term neonates when contrasted with solid term neonates. There is a critical relationship between free bilirubin in embittered term neonates when contrasted with solid ter.mTcB test doesn't appear to straightforwardly supplant UB estimation. Be that as it may, TcB and UB are connected ,UB adds to the skin bilirubin statement yet it isn't the main bilirubin species estimated by transcutaneous bilirubinometry.