Mastocytosis can be related to her iron deficiency anemia. She should be seen by a doctor, as soon as possible. This is all the more necessary as her GP mentioned that she needs blood transfusion, which indicates that her hemoglobin is too low. You can consider going to Accident and Emergency services, where the investigations may be repeated and accordingly treatment decision can be taken immediately. A blood transfusion also can be done there.
A colonoscopy is usually advised as there can be polyps in the intestines (benign growths) which can bleed intermittently and can cause anemia. Ferritin is a blood test which evaluates for the total iron available in the body. Serum ferritin is the most useful test for diagnosing iron-deficiency anemia.
The most common causes are;
1) iron deficiency (with or without blood loss),
2) chronic disease/inflammation
3) chronic kidney disease
4) deficiencies of folate or vitamin B-12,
5) diseases of the bone marrow
6) hypothyroidism, hypersplenism, and hemolytic anemia
So investigations entail;
1) Complete blood count (CBC)
2) Peripheral blood film
3) Vitamin B-12
5) Reticulocyte count
7) Thyroid-stimulating hormone
8) Serum creatinine and estimated glomerular filtration rate
9) Serum ferritin
10) Serum iron
11) Total iron-binding capacity
So these investigations need to be done for the exact assessment and long term management.
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