Are Bile Duct Obstructions Always Congenital?

Bile duct obstructions in babies are congenital, usually presenting with jaundice symptoms within 2 to 3 weeks after birth. If left untreated, it may lead to liver cirrhosis. It is recommended to seek timely medical check-ups and treatment at professional hospitals.
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Are the Calcium and Alkaline Phosphatase in the Blood Test for Trace Elements the Same?

A one-and-a-half-month-old baby is experiencing nape baldness and milk regurgitation, and someone suggested it might be due to calcium deficiency. The parents have already undergone a trace element test, which shows no calcium deficiency. What tests are needed if there is a suspicion of low blood calcium? Is there a test called alkaline phosphatase? Is this test the same as the calcium in trace elements?
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