TCM diagnosis based on syndrome differentiation:
1. Yin Deficiency of Liver and Kidney
Symptoms: dark red purpura in lower limbs, nasal and gingiva bleeding, hematochezia, hematuria, night sweat, dry mouth, dry stool, red tongue with less coating.

2. Yang Deficiency of  Spleen and Kidney
Symptoms: aversion to cold, pale complexion, abdominal distension, loose stool, edema, soreness of waist, slow pulse.

3. Blood-heat
Symptoms: reddish purpura, red tongue, yellow and greasy coating, weak pulse, aversion to cold, fever, sore throat.

4. Deficiency of Qi and Blood
Symptoms: light red purpura from time to time, delayed menstruation, scanty period, dizziness, fatigue, shortness of breath, palpitation, spontaneous perspiration, light tongue with whitish coating,  thin and weak pulse.

Diagnosis in western medicine
Thrombocytopenia means a reduction in the platelet count below the normal lower limit, which is usually defined as 150 x 109/L. This can have a variety of causes, including a reduction in platelet production, a reduction in platelet survival, and dilution of platelet numbers resulting from the transfusion of platelet-poor blood. The risk of bleeding is not based on the platelet count alone; age, comorbidity, the need for anticoagulation, risk of trauma, and any need for surgery should also be considered when managing people with thrombocytopenia. Platelet function abnormalities (thrombocytopathy) include a range of inherited and acquired defects of platelet function. Thrombocytopathy may cause a thrombotic or a bleeding tendency or may be part of a wider disorder such as myelodysplasia.

Your health care provider will perform a physical exam and ask about your medical history and symptoms. The following tests may be done:
1) Complete blood count (CBC)
2) Blood clotting studies (PTT and PT)

Other tests that may help diagnose this condition include bone marrow aspiration or biopsy.