Does sickle cell status negative mean am aa?

Yes.: A normal hemoglobin genotype would be denoted aa, sickle cell trait is denoted as and sickle cell disease is ss.

Likely, not absolute: Sickle cell negative can mean that a sickle prep test was performed and no sickle hemoglobin was identified. Alternatively, a hemoglobin electrophoresis test was performed and did not show hemoglobin s. Absence of s make the aa genotype most likely; however, there are many other hemoglobin variants beside hemoglobin s. Examples are c, d, e--these all give negative results on the sickle prep test.