Iron Deficiency Anemia: The patient's hemoglobin and hematocrit levels are slightly below the normal range for a male of his age, and the MCH is low, which can indicate iron deficiency anemia. This condition is common in adolescents due to increased iron requirements during growth spurts.

Anemia of Chronic Disease: This could be a consideration if the patient has a chronic condition such as inflammatory bowel disease, chronic infections, or malignancies. The slightly low hemoglobin and hematocrit could be indicative of this, especially if there are other systemic symptoms.
Thalassemia Trait: Given the low MCH and relatively low hemoglobin and hematocrit, thalassemia trait should be considered, especially if there is a family history. This condition often presents with mild anemia and low MCH.

Leukemia or Lymphoma: Although the lymphocytic percentage is within a relatively normal range, any abnormality in blood cell counts in a child warrants consideration of malignancies like leukemia or lymphoma. These conditions can present with a wide range of blood count abnormalities.
Sickle Cell Disease or Other Hemoglobinopathies: These conditions can cause anemia and have significant implications for management and prognosis. A hemoglobin electrophoresis would be necessary to diagnose these conditions.
Bleeding Disorders: With a platelet count at the lower end of the normal range, bleeding disorders such as thrombocytopenia or platelet function disorders should be considered, especially if there is a history of easy bruising or bleeding.

Congenital Dyserythropoietic Anemias: These are a group of rare genetic disorders characterized by anemia and distinct morphological abnormalities in erythroblasts. They would be considered if more common causes of anemia are ruled out.
Diamond-Blackfan Anemia: A rare congenital condition characterized by pure red cell aplasia. It's a diagnosis to consider in a child with anemia and low reticulocyte count, especially if other cell lines are normal.
Shwachman-Diamond Syndrome: A rare genetic disorder that affects the pancreas, bone marrow, and skeleton, leading to anemia, neutropenia, and thrombocytopenia among other symptoms.