Question

A 24-year-old woman is evaluated in the endocrinology clinic. She is on 100 mcg of thyroxine per day for treatment of Hashimoto's thyroiditis and receives oral steroids for autoimmune adrenal insufficiency. In addition, she complains of fatigue, numbness, and tingling in her feet.

When routine labs were drawn, the following values were noted:

Hb: 9.9 g/dL
MCV: 102
Iron indices: normal
Folate: normal
B12: low
Parietal cell antibodies: high

What is the likely diagnosis?

Answer 1

The likely diagnosis is vitamin B12 deficiency.

Step-by-step explanation:

The likely diagnosis for the 24-year-old woman is vitamin B12 deficiency. The symptoms of fatigue, numbness, and tingling in her feet, along with the low B12 level and high parietal cell antibodies, are indicative of this condition. Hashimoto's thyroiditis and autoimmune adrenal insufficiency are unrelated to her symptoms and lab values.