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Every thing appears to be fine except that hemoglobin
is less than normal range, which would require iron supplements
Above 34 years, pregnancy is considered to have a slightly increased possibility of the baby having anomalies, hence the obstetrician does these special tests including amniocentesis
scan may miss some of the anomalies.
If your obstetrician thinks amniocentesis is required then you have to follow his/her instructions.