Dr called said blood tests were normal Rcvd lab results MCH is low & total Bilirubin @1.9. All other results are in normal range. What does this mean?

Maybe Gilbert's? It is a familial (autosomal dominant), common (2-5% of people), unconjugated hyperbilirubinemia (blood bilirubin measures 1-5mg/dl), not due to breakdown of blood. It is associated with reduced enzyme levels of udp glycuronyl transferase, that results in jaundice when patients fast or suffer an infection. It does not shorten life or raise insurance rates, but may predispose to tylenol (acetaminophen) toxicity.