The normal range for hemoglobin is: 1  For men, 13.5 to 17.5 grams per deciliter. 2  For women, 12.0 to 15.5 grams per deciliter.he normal range for hemoglobin is: 1  For men, 13.5 to 17.5 grams per deciliter. 2  For women, 12.0 to 15.5 grams per deciliter.
Abnormal results mean there is an abnormality in the size, shape, color, or coating of the red blood cells (RBCs). Some abnormalities may be graded on a 4-point scale: 1+ means 25% of cells are affected.
1 Direct Coombs test. A negative test result means that your blood does not have antibodies attached to your red blood cells.  Indirect Coombs test. A negative test result means that your blood is compatible with the blood you are to receive by transfusion. A negative indirect Coombs test for Rh factor (Rh antibody titer) in a pregnant woman means that she has not developed antibodies against the Rh-positive blood of her baby.